Finding the Fourth Proportional to 378,868.59, 522,837.59 and 209,101.50

Step by Step Solution

1. Step 1: Write the proportion equation
   378,868.59 : 522,837.59 = 209,101.50 : x
2. Step 2: Convert to fraction form
   378,868.59/522,837.59 = 209,101.50/x
3. Step 3: Cross multiply
   378,868.59x = 522,837.59 × 209,101.50
4. Step 4: Simplify right side
   378,868.59x = 109,326,123,279.88
5. Step 5: Solve for x
   x = 109,326,123,279.88/378,868.59
6. Step 6: Final answer
   x = 288,559.48