Finding the Fourth Proportional to 10,386.89, 15,571.07 and 3,811.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,386.89 : 15,571.07 = 3,811.55 : x
2. Step 2: Convert to fraction form
   10,386.89/15,571.07 = 3,811.55/x
3. Step 3: Cross multiply
   10,386.89x = 15,571.07 × 3,811.55
4. Step 4: Simplify right side
   10,386.89x = 59,349,814.95
5. Step 5: Solve for x
   x = 59,349,814.95/10,386.89
6. Step 6: Final answer
   x = 5,713.92