Finding the Fourth Proportional to 378,180.72, 521,886.78 and 208,414.98

Step by Step Solution

1. Step 1: Write the proportion equation
   378,180.72 : 521,886.78 = 208,414.98 : x
2. Step 2: Convert to fraction form
   378,180.72/521,886.78 = 208,414.98/x
3. Step 3: Cross multiply
   378,180.72x = 521,886.78 × 208,414.98
4. Step 4: Simplify right side
   378,180.72x = 108,769,022,815.96
5. Step 5: Solve for x
   x = 108,769,022,815.96/378,180.72
6. Step 6: Final answer
   x = 287,611.23