Finding the Fourth Proportional to 288,123.30, 431,796.15 and 204,920.10

Step by Step Solution

1. Step 1: Write the proportion equation
   288,123.30 : 431,796.15 = 204,920.10 : x
2. Step 2: Convert to fraction form
   288,123.30/431,796.15 = 204,920.10/x
3. Step 3: Cross multiply
   288,123.30x = 431,796.15 × 204,920.10
4. Step 4: Simplify right side
   288,123.30x = 88,483,710,237.62
5. Step 5: Solve for x
   x = 88,483,710,237.62/288,123.30
6. Step 6: Final answer
   x = 307,103.63