Finding the Fourth Proportional to 81,103.42, 121,578.58 and 39,007.31

Step by Step Solution

1. Step 1: Write the proportion equation
   81,103.42 : 121,578.58 = 39,007.31 : x
2. Step 2: Convert to fraction form
   81,103.42/121,578.58 = 39,007.31/x
3. Step 3: Cross multiply
   81,103.42x = 121,578.58 × 39,007.31
4. Step 4: Simplify right side
   81,103.42x = 4,742,453,565.85
5. Step 5: Solve for x
   x = 4,742,453,565.85/81,103.42
6. Step 6: Final answer
   x = 58,474.15