Finding the Fourth Proportional to 71,670.72, 98,903.04 and 39,840.96

Step by Step Solution

1. Step 1: Write the proportion equation
   71,670.72 : 98,903.04 = 39,840.96 : x
2. Step 2: Convert to fraction form
   71,670.72/98,903.04 = 39,840.96/x
3. Step 3: Cross multiply
   71,670.72x = 98,903.04 × 39,840.96
4. Step 4: Simplify right side
   71,670.72x = 3,940,392,060.52
5. Step 5: Solve for x
   x = 3,940,392,060.52/71,670.72
6. Step 6: Final answer
   x = 54,979.11