Finding the Fourth Proportional to 82,399.18, 123,457.49 and 55,330.78

Step by Step Solution

1. Step 1: Write the proportion equation
   82,399.18 : 123,457.49 = 55,330.78 : x
2. Step 2: Convert to fraction form
   82,399.18/123,457.49 = 55,330.78/x
3. Step 3: Cross multiply
   82,399.18x = 123,457.49 × 55,330.78
4. Step 4: Simplify right side
   82,399.18x = 6,830,999,048.23
5. Step 5: Solve for x
   x = 6,830,999,048.23/82,399.18
6. Step 6: Final answer
   x = 82,901.30