Finding the Fourth Proportional to 82,570.80, 113,688.72 and 72,870.24

Step by Step Solution

1. Step 1: Write the proportion equation
   82,570.80 : 113,688.72 = 72,870.24 : x
2. Step 2: Convert to fraction form
   82,570.80/113,688.72 = 72,870.24/x
3. Step 3: Cross multiply
   82,570.80x = 113,688.72 × 72,870.24
4. Step 4: Simplify right side
   82,570.80x = 8,284,524,311.69
5. Step 5: Solve for x
   x = 8,284,524,311.69/82,570.80
6. Step 6: Final answer
   x = 100,332.37