Finding the Fourth Proportional to 57,639.32, 79,536.54 and 42,540.14

Step by Step Solution

1. Step 1: Write the proportion equation
   57,639.32 : 79,536.54 = 42,540.14 : x
2. Step 2: Convert to fraction form
   57,639.32/79,536.54 = 42,540.14/x
3. Step 3: Cross multiply
   57,639.32x = 79,536.54 × 42,540.14
4. Step 4: Simplify right side
   57,639.32x = 3,383,495,546.72
5. Step 5: Solve for x
   x = 3,383,495,546.72/57,639.32
6. Step 6: Final answer
   x = 58,701.17