Finding the Fourth Proportional to 102,940.85, 142,056.91 and 56,996.10

Step by Step Solution

1. Step 1: Write the proportion equation
   102,940.85 : 142,056.91 = 56,996.10 : x
2. Step 2: Convert to fraction form
   102,940.85/142,056.91 = 56,996.10/x
3. Step 3: Cross multiply
   102,940.85x = 142,056.91 × 56,996.10
4. Step 4: Simplify right side
   102,940.85x = 8,096,689,598.69
5. Step 5: Solve for x
   x = 8,096,689,598.69/102,940.85
6. Step 6: Final answer
   x = 78,653.81