Finding the Fourth Proportional to 663,520, 915,630.42 and 373,123.30

Step by Step Solution

1. Step 1: Write the proportion equation
   663,520 : 915,630.42 = 373,123.30 : x
2. Step 2: Convert to fraction form
   663,520/915,630.42 = 373,123.30/x
3. Step 3: Cross multiply
   663,520x = 915,630.42 × 373,123.30
4. Step 4: Simplify right side
   663,520x = 341,643,043,890.79
5. Step 5: Solve for x
   x = 341,643,043,890.79/663,520
6. Step 6: Final answer
   x = 514,894.87