Finding the Fourth Proportional to 429,825,677.47, 644,865,012.33 and 138,687,338.59

Step by Step Solution

1. Step 1: Write the proportion equation
   429,825,677.47 : 644,865,012.33 = 138,687,338.59 : x
2. Step 2: Convert to fraction form
   429,825,677.47/644,865,012.33 = 138,687,338.59/x
3. Step 3: Cross multiply
   429,825,677.47x = 644,865,012.33 × 138,687,338.59
4. Step 4: Simplify right side
   429,825,677.47x = 89,434,612,309,855,248
5. Step 5: Solve for x
   x = 89,434,612,309,855,248/429,825,677.47
6. Step 6: Final answer
   x = 208,071,823.06