Finding the Fourth Proportional to 687,148,978.50, 1,029,422,963.34 and 406,188,743.22

Step by Step Solution

1. Step 1: Write the proportion equation
   687,148,978.50 : 1,029,422,963.34 = 406,188,743.22 : x
2. Step 2: Convert to fraction form
   687,148,978.50/1,029,422,963.34 = 406,188,743.22/x
3. Step 3: Cross multiply
   687,148,978.50x = 1,029,422,963.34 × 406,188,743.22
4. Step 4: Simplify right side
   687,148,978.50x = 418,140,019,720,882,752
5. Step 5: Solve for x
   x = 418,140,019,720,882,752/687,148,978.50
6. Step 6: Final answer
   x = 608,514,358.32