Finding the Fourth Proportional to 42,700.88, 58,910.28 and 28,531.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,700.88 : 58,910.28 = 28,531.28 : x
2. Step 2: Convert to fraction form
   42,700.88/58,910.28 = 28,531.28/x
3. Step 3: Cross multiply
   42,700.88x = 58,910.28 × 28,531.28
4. Step 4: Simplify right side
   42,700.88x = 1,680,785,693.56
5. Step 5: Solve for x
   x = 1,680,785,693.56/42,700.88
6. Step 6: Final answer
   x = 39,361.85