Finding the Fourth Proportional to 378,184.72, 521,892.28 and 208,419

Step by Step Solution

1. Step 1: Write the proportion equation
   378,184.72 : 521,892.28 = 208,419 : x
2. Step 2: Convert to fraction form
   378,184.72/521,892.28 = 208,419/x
3. Step 3: Cross multiply
   378,184.72x = 521,892.28 × 208,419
4. Step 4: Simplify right side
   378,184.72x = 108,772,267,105.32
5. Step 5: Solve for x
   x = 108,772,267,105.32/378,184.72
6. Step 6: Final answer
   x = 287,616.77