Finding the Fourth Proportional to 61,148.72, 84,397.34 and 39,665.09

Step by Step Solution

1. Step 1: Write the proportion equation
   61,148.72 : 84,397.34 = 39,665.09 : x
2. Step 2: Convert to fraction form
   61,148.72/84,397.34 = 39,665.09/x
3. Step 3: Cross multiply
   61,148.72x = 84,397.34 × 39,665.09
4. Step 4: Simplify right side
   61,148.72x = 3,347,628,086.86
5. Step 5: Solve for x
   x = 3,347,628,086.86/61,148.72
6. Step 6: Final answer
   x = 54,745.68