Finding the Fourth Proportional to 171,978.96, 258,068.88 and 72,131.52

Step by Step Solution

1. Step 1: Write the proportion equation
   171,978.96 : 258,068.88 = 72,131.52 : x
2. Step 2: Convert to fraction form
   171,978.96/258,068.88 = 72,131.52/x
3. Step 3: Cross multiply
   171,978.96x = 258,068.88 × 72,131.52
4. Step 4: Simplify right side
   171,978.96x = 18,614,900,579.10
5. Step 5: Solve for x
   x = 18,614,900,579.10/171,978.96
6. Step 6: Final answer
   x = 108,239.41