Finding the Fourth Proportional to 82,083.20, 123,128.64 and 42,615.36

Step by Step Solution

1. Step 1: Write the proportion equation
   82,083.20 : 123,128.64 = 42,615.36 : x
2. Step 2: Convert to fraction form
   82,083.20/123,128.64 = 42,615.36/x
3. Step 3: Cross multiply
   82,083.20x = 123,128.64 × 42,615.36
4. Step 4: Simplify right side
   82,083.20x = 5,247,171,319.91
5. Step 5: Solve for x
   x = 5,247,171,319.91/82,083.20
6. Step 6: Final answer
   x = 63,925.03