Finding the Fourth Proportional to 102,020.17, 140,787.71 and 56,696.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,020.17 : 140,787.71 = 56,696.72 : x
2. Step 2: Convert to fraction form
   102,020.17/140,787.71 = 56,696.72/x
3. Step 3: Cross multiply
   102,020.17x = 140,787.71 × 56,696.72
4. Step 4: Simplify right side
   102,020.17x = 7,982,201,373.31
5. Step 5: Solve for x
   x = 7,982,201,373.31/102,020.17
6. Step 6: Final answer
   x = 78,241.40