Finding the Fourth Proportional to 81,978.24, 112,892.16 and 71,218.24

Step by Step Solution

1. Step 1: Write the proportion equation
   81,978.24 : 112,892.16 = 71,218.24 : x
2. Step 2: Convert to fraction form
   81,978.24/112,892.16 = 71,218.24/x
3. Step 3: Cross multiply
   81,978.24x = 112,892.16 × 71,218.24
4. Step 4: Simplify right side
   81,978.24x = 8,039,980,945.00
5. Step 5: Solve for x
   x = 8,039,980,945.00/81,978.24
6. Step 6: Final answer
   x = 98,074.57