Finding the Fourth Proportional to 85,109.47, 127,777.29 and 72,709.18

Step by Step Solution

1. Step 1: Write the proportion equation
   85,109.47 : 127,777.29 = 72,709.18 : x
2. Step 2: Convert to fraction form
   85,109.47/127,777.29 = 72,709.18/x
3. Step 3: Cross multiply
   85,109.47x = 127,777.29 × 72,709.18
4. Step 4: Simplify right side
   85,109.47x = 9,290,581,978.52
5. Step 5: Solve for x
   x = 9,290,581,978.52/85,109.47
6. Step 6: Final answer
   x = 109,160.38