Finding the Fourth Proportional to 59,186.88, 81,564.84 and 42,390.72

Step by Step Solution

1. Step 1: Write the proportion equation
   59,186.88 : 81,564.84 = 42,390.72 : x
2. Step 2: Convert to fraction form
   59,186.88/81,564.84 = 42,390.72/x
3. Step 3: Cross multiply
   59,186.88x = 81,564.84 × 42,390.72
4. Step 4: Simplify right side
   59,186.88x = 3,457,592,294.28
5. Step 5: Solve for x
   x = 3,457,592,294.28/59,186.88
6. Step 6: Final answer
   x = 58,418.22