Finding the Fourth Proportional to 377,524.96, 521,005.86 and 216,406.78

Step by Step Solution

1. Step 1: Write the proportion equation
   377,524.96 : 521,005.86 = 216,406.78 : x
2. Step 2: Convert to fraction form
   377,524.96/521,005.86 = 216,406.78/x
3. Step 3: Cross multiply
   377,524.96x = 521,005.86 × 216,406.78
4. Step 4: Simplify right side
   377,524.96x = 112,749,200,523.73
5. Step 5: Solve for x
   x = 112,749,200,523.73/377,524.96
6. Step 6: Final answer
   x = 298,653.63