Finding the Fourth Proportional to 377,809, 521,376.42 and 208,042.72

Step by Step Solution

1. Step 1: Write the proportion equation
   377,809 : 521,376.42 = 208,042.72 : x
2. Step 2: Convert to fraction form
   377,809/521,376.42 = 208,042.72/x
3. Step 3: Cross multiply
   377,809x = 521,376.42 × 208,042.72
4. Step 4: Simplify right side
   377,809x = 108,468,568,560.66
5. Step 5: Solve for x
   x = 108,468,568,560.66/377,809
6. Step 6: Final answer
   x = 287,098.95