Finding the Fourth Proportional to 9,866.66, 13,615.40 and 5,389.52

Step by Step Solution

1. Step 1: Write the proportion equation
   9,866.66 : 13,615.40 = 5,389.52 : x
2. Step 2: Convert to fraction form
   9,866.66/13,615.40 = 5,389.52/x
3. Step 3: Cross multiply
   9,866.66x = 13,615.40 × 5,389.52
4. Step 4: Simplify right side
   9,866.66x = 73,380,470.61
5. Step 5: Solve for x
   x = 73,380,470.61/9,866.66
6. Step 6: Final answer
   x = 7,437.21