Finding the Fourth Proportional to 82,742.80, 123,822.60 and 57,665.20

Step by Step Solution

1. Step 1: Write the proportion equation
   82,742.80 : 123,822.60 = 57,665.20 : x
2. Step 2: Convert to fraction form
   82,742.80/123,822.60 = 57,665.20/x
3. Step 3: Cross multiply
   82,742.80x = 123,822.60 × 57,665.20
4. Step 4: Simplify right side
   82,742.80x = 7,140,254,993.52
5. Step 5: Solve for x
   x = 7,140,254,993.52/82,742.80
6. Step 6: Final answer
   x = 86,294.58