Finding the Fourth Proportional to 71,917.47, 99,242.01 and 40,085.28

Step by Step Solution

1. Step 1: Write the proportion equation
   71,917.47 : 99,242.01 = 40,085.28 : x
2. Step 2: Convert to fraction form
   71,917.47/99,242.01 = 40,085.28/x
3. Step 3: Cross multiply
   71,917.47x = 99,242.01 × 40,085.28
4. Step 4: Simplify right side
   71,917.47x = 3,978,143,758.61
5. Step 5: Solve for x
   x = 3,978,143,758.61/71,917.47
6. Step 6: Final answer
   x = 55,315.40