Finding the Fourth Proportional to 85,111.98, 127,781.04 and 72,711.68

Step by Step Solution

1. Step 1: Write the proportion equation
   85,111.98 : 127,781.04 = 72,711.68 : x
2. Step 2: Convert to fraction form
   85,111.98/127,781.04 = 72,711.68/x
3. Step 3: Cross multiply
   85,111.98x = 127,781.04 × 72,711.68
4. Step 4: Simplify right side
   85,111.98x = 9,291,174,090.55
5. Step 5: Solve for x
   x = 9,291,174,090.55/85,111.98
6. Step 6: Final answer
   x = 109,164.12