Finding the Fourth Proportional to 86,631.64, 129,874.56 and 42,235.54

Step by Step Solution

1. Step 1: Write the proportion equation
   86,631.64 : 129,874.56 = 42,235.54 : x
2. Step 2: Convert to fraction form
   86,631.64/129,874.56 = 42,235.54/x
3. Step 3: Cross multiply
   86,631.64x = 129,874.56 × 42,235.54
4. Step 4: Simplify right side
   86,631.64x = 5,485,322,173.86
5. Step 5: Solve for x
   x = 5,485,322,173.86/86,631.64
6. Step 6: Final answer
   x = 63,317.77