Finding the Fourth Proportional to 81,288.94, 111,929.46 and 71,160.70

Step by Step Solution

1. Step 1: Write the proportion equation
   81,288.94 : 111,929.46 = 71,160.70 : x
2. Step 2: Convert to fraction form
   81,288.94/111,929.46 = 71,160.70/x
3. Step 3: Cross multiply
   81,288.94x = 111,929.46 × 71,160.70
4. Step 4: Simplify right side
   81,288.94x = 7,964,978,724.22
5. Step 5: Solve for x
   x = 7,964,978,724.22/81,288.94
6. Step 6: Final answer
   x = 97,983.55