Finding the Fourth Proportional to 171,978.39, 257,884.56 and 72,111.67

Step by Step Solution

1. Step 1: Write the proportion equation
   171,978.39 : 257,884.56 = 72,111.67 : x
2. Step 2: Convert to fraction form
   171,978.39/257,884.56 = 72,111.67/x
3. Step 3: Cross multiply
   171,978.39x = 257,884.56 × 72,111.67
4. Step 4: Simplify right side
   171,978.39x = 18,596,485,644.10
5. Step 5: Solve for x
   x = 18,596,485,644.10/171,978.39
6. Step 6: Final answer
   x = 108,132.69