Finding the Fourth Proportional to 10,385.30, 15,580.25 and 3,811.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,385.30 : 15,580.25 = 3,811.55 : x
2. Step 2: Convert to fraction form
   10,385.30/15,580.25 = 3,811.55/x
3. Step 3: Cross multiply
   10,385.30x = 15,580.25 × 3,811.55
4. Step 4: Simplify right side
   10,385.30x = 59,384,804.93
5. Step 5: Solve for x
   x = 59,384,804.93/10,385.30
6. Step 6: Final answer
   x = 5,718.16