Finding the Fourth Proportional to 42,143.52, 58,424.34 and 39,896.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,143.52 : 58,424.34 = 39,896.31 : x
2. Step 2: Convert to fraction form
   42,143.52/58,424.34 = 39,896.31/x
3. Step 3: Cross multiply
   42,143.52x = 58,424.34 × 39,896.31
4. Step 4: Simplify right side
   42,143.52x = 2,330,915,580.19
5. Step 5: Solve for x
   x = 2,330,915,580.19/42,143.52
6. Step 6: Final answer
   x = 55,308.99