Finding the Fourth Proportional to 9,866.27, 13,615.29 and 5,389.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,866.27 : 13,615.29 = 5,389.91 : x
2. Step 2: Convert to fraction form
   9,866.27/13,615.29 = 5,389.91/x
3. Step 3: Cross multiply
   9,866.27x = 13,615.29 × 5,389.91
4. Step 4: Simplify right side
   9,866.27x = 73,385,160.77
5. Step 5: Solve for x
   x = 73,385,160.77/9,866.27
6. Step 6: Final answer
   x = 7,437.98