Finding the Fourth Proportional to 10,385.88, 15,580.98 and 3,811.80

Step by Step Solution

1. Step 1: Write the proportion equation
   10,385.88 : 15,580.98 = 3,811.80 : x
2. Step 2: Convert to fraction form
   10,385.88/15,580.98 = 3,811.80/x
3. Step 3: Cross multiply
   10,385.88x = 15,580.98 × 3,811.80
4. Step 4: Simplify right side
   10,385.88x = 59,391,579.56
5. Step 5: Solve for x
   x = 59,391,579.56/10,385.88
6. Step 6: Final answer
   x = 5,718.49