Finding the Fourth Proportional to 471,978.72, 707,780.16 and 172,391.04

Step by Step Solution

1. Step 1: Write the proportion equation
   471,978.72 : 707,780.16 = 172,391.04 : x
2. Step 2: Convert to fraction form
   471,978.72/707,780.16 = 172,391.04/x
3. Step 3: Cross multiply
   471,978.72x = 707,780.16 × 172,391.04
4. Step 4: Simplify right side
   471,978.72x = 122,014,957,873.77
5. Step 5: Solve for x
   x = 122,014,957,873.77/471,978.72
6. Step 6: Final answer
   x = 258,517.92