Finding the Fourth Proportional to 569,978.96, 786,049.80 and 489,380.72

Step by Step Solution

1. Step 1: Write the proportion equation
   569,978.96 : 786,049.80 = 489,380.72 : x
2. Step 2: Convert to fraction form
   569,978.96/786,049.80 = 489,380.72/x
3. Step 3: Cross multiply
   569,978.96x = 786,049.80 × 489,380.72
4. Step 4: Simplify right side
   569,978.96x = 384,677,617,079.86
5. Step 5: Solve for x
   x = 384,677,617,079.86/569,978.96
6. Step 6: Final answer
   x = 674,897.92