Finding the Fourth Proportional to 407,861.43, 562,916.18 and 339,770.55

Step by Step Solution

1. Step 1: Write the proportion equation
   407,861.43 : 562,916.18 = 339,770.55 : x
2. Step 2: Convert to fraction form
   407,861.43/562,916.18 = 339,770.55/x
3. Step 3: Cross multiply
   407,861.43x = 562,916.18 × 339,770.55
4. Step 4: Simplify right side
   407,861.43x = 191,262,339,876.46
5. Step 5: Solve for x
   x = 191,262,339,876.46/407,861.43
6. Step 6: Final answer
   x = 468,939.52