Finding the Fourth Proportional to 25,555.99, 38,338.83 and 8,920.78

Step by Step Solution

1. Step 1: Write the proportion equation
   25,555.99 : 38,338.83 = 8,920.78 : x
2. Step 2: Convert to fraction form
   25,555.99/38,338.83 = 8,920.78/x
3. Step 3: Cross multiply
   25,555.99x = 38,338.83 × 8,920.78
4. Step 4: Simplify right side
   25,555.99x = 342,012,267.89
5. Step 5: Solve for x
   x = 342,012,267.89/25,555.99
6. Step 6: Final answer
   x = 13,382.86