Finding the Fourth Proportional to 122,978.56, 169,714.32 and 71,996.32

Step by Step Solution

1. Step 1: Write the proportion equation
   122,978.56 : 169,714.32 = 71,996.32 : x
2. Step 2: Convert to fraction form
   122,978.56/169,714.32 = 71,996.32/x
3. Step 3: Cross multiply
   122,978.56x = 169,714.32 × 71,996.32
4. Step 4: Simplify right side
   122,978.56x = 12,218,806,491.30
5. Step 5: Solve for x
   x = 12,218,806,491.30/122,978.56
6. Step 6: Final answer
   x = 99,357.21