Finding the Fourth Proportional to 10,039.55, 13,854.20 and 5,790.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,039.55 : 13,854.20 = 5,790.78 : x
2. Step 2: Convert to fraction form
   10,039.55/13,854.20 = 5,790.78/x
3. Step 3: Cross multiply
   10,039.55x = 13,854.20 × 5,790.78
4. Step 4: Simplify right side
   10,039.55x = 80,226,595.32
5. Step 5: Solve for x
   x = 80,226,595.32/10,039.55
6. Step 6: Final answer
   x = 7,991.06