Finding the Fourth Proportional to 378,870.47, 522,840.17 and 209,103.38

Step by Step Solution

1. Step 1: Write the proportion equation
   378,870.47 : 522,840.17 = 209,103.38 : x
2. Step 2: Convert to fraction form
   378,870.47/522,840.17 = 209,103.38/x
3. Step 3: Cross multiply
   378,870.47x = 522,840.17 × 209,103.38
4. Step 4: Simplify right side
   378,870.47x = 109,327,643,087.06
5. Step 5: Solve for x
   x = 109,327,643,087.06/378,870.47
6. Step 6: Final answer
   x = 288,562.06