Finding the Fourth Proportional to 531,300.89, 733,188.78 and 289,582.72

Step by Step Solution

1. Step 1: Write the proportion equation
   531,300.89 : 733,188.78 = 289,582.72 : x
2. Step 2: Convert to fraction form
   531,300.89/733,188.78 = 289,582.72/x
3. Step 3: Cross multiply
   531,300.89x = 733,188.78 × 289,582.72
4. Step 4: Simplify right side
   531,300.89x = 212,318,799,352.91
5. Step 5: Solve for x
   x = 212,318,799,352.91/531,300.89
6. Step 6: Final answer
   x = 399,620.63