Finding the Fourth Proportional to 81,270.72, 111,904.24 and 71,142.48

Step by Step Solution

1. Step 1: Write the proportion equation
   81,270.72 : 111,904.24 = 71,142.48 : x
2. Step 2: Convert to fraction form
   81,270.72/111,904.24 = 71,142.48/x
3. Step 3: Cross multiply
   81,270.72x = 111,904.24 × 71,142.48
4. Step 4: Simplify right side
   81,270.72x = 7,961,145,156.12
5. Step 5: Solve for x
   x = 7,961,145,156.12/81,270.72
6. Step 6: Final answer
   x = 97,958.34