Finding the Fourth Proportional to 139,213,025.29, 208,787,142.45 and 51,815,702.17

Step by Step Solution

1. Step 1: Write the proportion equation
   139,213,025.29 : 208,787,142.45 = 51,815,702.17 : x
2. Step 2: Convert to fraction form
   139,213,025.29/208,787,142.45 = 51,815,702.17/x
3. Step 3: Cross multiply
   139,213,025.29x = 208,787,142.45 × 51,815,702.17
4. Step 4: Simplify right side
   139,213,025.29x = 10,818,452,390,114,564
5. Step 5: Solve for x
   x = 10,818,452,390,114,564/139,213,025.29
6. Step 6: Final answer
   x = 77,711,495.51