Finding the Fourth Proportional to 42,257.88, 58,302.72 and 28,113.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,257.88 : 58,302.72 = 28,113.12 : x
2. Step 2: Convert to fraction form
   42,257.88/58,302.72 = 28,113.12/x
3. Step 3: Cross multiply
   42,257.88x = 58,302.72 × 28,113.12
4. Step 4: Simplify right side
   42,257.88x = 1,639,071,363.69
5. Step 5: Solve for x
   x = 1,639,071,363.69/42,257.88
6. Step 6: Final answer
   x = 38,787.35