Finding the Fourth Proportional to 82,080.57, 123,143.42 and 69,688.49

Step by Step Solution

1. Step 1: Write the proportion equation
   82,080.57 : 123,143.42 = 69,688.49 : x
2. Step 2: Convert to fraction form
   82,080.57/123,143.42 = 69,688.49/x
3. Step 3: Cross multiply
   82,080.57x = 123,143.42 × 69,688.49
4. Step 4: Simplify right side
   82,080.57x = 8,581,678,029.08
5. Step 5: Solve for x
   x = 8,581,678,029.08/82,080.57
6. Step 6: Final answer
   x = 104,551.88