Finding the Fourth Proportional to 82,166.10, 123,253.20 and 42,800.10

Step by Step Solution

1. Step 1: Write the proportion equation
   82,166.10 : 123,253.20 = 42,800.10 : x
2. Step 2: Convert to fraction form
   82,166.10/123,253.20 = 42,800.10/x
3. Step 3: Cross multiply
   82,166.10x = 123,253.20 × 42,800.10
4. Step 4: Simplify right side
   82,166.10x = 5,275,249,285.32
5. Step 5: Solve for x
   x = 5,275,249,285.32/82,166.10
6. Step 6: Final answer
   x = 64,202.26