Finding the Fourth Proportional to 9,389.61, 12,959.98 and 5,615.01

Step by Step Solution

1. Step 1: Write the proportion equation
   9,389.61 : 12,959.98 = 5,615.01 : x
2. Step 2: Convert to fraction form
   9,389.61/12,959.98 = 5,615.01/x
3. Step 3: Cross multiply
   9,389.61x = 12,959.98 × 5,615.01
4. Step 4: Simplify right side
   9,389.61x = 72,770,403.26
5. Step 5: Solve for x
   x = 72,770,403.26/9,389.61
6. Step 6: Final answer
   x = 7,750.10