Finding the Fourth Proportional to 378,882.02, 522,854.52 and 209,116.10

Step by Step Solution

1. Step 1: Write the proportion equation
   378,882.02 : 522,854.52 = 209,116.10 : x
2. Step 2: Convert to fraction form
   378,882.02/522,854.52 = 209,116.10/x
3. Step 3: Cross multiply
   378,882.02x = 522,854.52 × 209,116.10
4. Step 4: Simplify right side
   378,882.02x = 109,337,298,089.77
5. Step 5: Solve for x
   x = 109,337,298,089.77/378,882.02
6. Step 6: Final answer
   x = 288,578.75