Finding the Fourth Proportional to 489,861.05, 676,002.31 and 274,995.59

Step by Step Solution

1. Step 1: Write the proportion equation
   489,861.05 : 676,002.31 = 274,995.59 : x
2. Step 2: Convert to fraction form
   489,861.05/676,002.31 = 274,995.59/x
3. Step 3: Cross multiply
   489,861.05x = 676,002.31 × 274,995.59
4. Step 4: Simplify right side
   489,861.05x = 185,897,650,012.31
5. Step 5: Solve for x
   x = 185,897,650,012.31/489,861.05
6. Step 6: Final answer
   x = 379,490.58