Finding the Fourth Proportional to 377,522.96, 521,003.10 and 216,404.78

Step by Step Solution

1. Step 1: Write the proportion equation
   377,522.96 : 521,003.10 = 216,404.78 : x
2. Step 2: Convert to fraction form
   377,522.96/521,003.10 = 216,404.78/x
3. Step 3: Cross multiply
   377,522.96x = 521,003.10 × 216,404.78
4. Step 4: Simplify right side
   377,522.96x = 112,747,561,234.82
5. Step 5: Solve for x
   x = 112,747,561,234.82/377,522.96
6. Step 6: Final answer
   x = 298,650.87