Finding the Fourth Proportional to 443,890.50, 612,571.05 and 242,686.50

Step by Step Solution

1. Step 1: Write the proportion equation
   443,890.50 : 612,571.05 = 242,686.50 : x
2. Step 2: Convert to fraction form
   443,890.50/612,571.05 = 242,686.50/x
3. Step 3: Cross multiply
   443,890.50x = 612,571.05 × 242,686.50
4. Step 4: Simplify right side
   443,890.50x = 148,662,724,125.83
5. Step 5: Solve for x
   x = 148,662,724,125.83/443,890.50
6. Step 6: Final answer
   x = 334,908.55