Finding the Third Proportional to 405,291 and 608,152.50

Step by Step Solution

1. Step 1: Write the proportion equation
   405,291 : 608,152.50 = 608,152.50 : x
2. Step 2: Convert to fraction form
   405,291/608,152.50 = 608,152.50/x
3. Step 3: Cross multiply
   405,291x = 608,152.50 × 608,152.50
4. Step 4: Simplify right side
   405,291x = 369,849,463,256.25
5. Step 5: Solve for x
   x = 369,849,463,256.25/405,291
6. Step 6: Final answer
   x = 912,552.87