Finding the Fourth Proportional to 10,287.13, 14,196.21 and 5,571.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,287.13 : 14,196.21 = 5,571.40 : x
2. Step 2: Convert to fraction form
   10,287.13/14,196.21 = 5,571.40/x
3. Step 3: Cross multiply
   10,287.13x = 14,196.21 × 5,571.40
4. Step 4: Simplify right side
   10,287.13x = 79,092,764.39
5. Step 5: Solve for x
   x = 79,092,764.39/10,287.13
6. Step 6: Final answer
   x = 7,688.52