Finding the Fourth Proportional to 429,825,678.47, 644,865,013.83 and 138,687,339.59

Step by Step Solution

1. Step 1: Write the proportion equation
   429,825,678.47 : 644,865,013.83 = 138,687,339.59 : x
2. Step 2: Convert to fraction form
   429,825,678.47/644,865,013.83 = 138,687,339.59/x
3. Step 3: Cross multiply
   429,825,678.47x = 644,865,013.83 × 138,687,339.59
4. Step 4: Simplify right side
   429,825,678.47x = 89,434,613,162,751,264
5. Step 5: Solve for x
   x = 89,434,613,162,751,264/429,825,678.47
6. Step 6: Final answer
   x = 208,071,824.56