Finding the Fourth Proportional to 82,507.18, 113,911.50 and 56,710.21

Step by Step Solution

1. Step 1: Write the proportion equation
   82,507.18 : 113,911.50 = 56,710.21 : x
2. Step 2: Convert to fraction form
   82,507.18/113,911.50 = 56,710.21/x
3. Step 3: Cross multiply
   82,507.18x = 113,911.50 × 56,710.21
4. Step 4: Simplify right side
   82,507.18x = 6,459,945,086.42
5. Step 5: Solve for x
   x = 6,459,945,086.42/82,507.18
6. Step 6: Final answer
   x = 78,295.55