Finding the Fourth Proportional to 9,615.77, 13,272.17 and 5,426.45

Step by Step Solution

1. Step 1: Write the proportion equation
   9,615.77 : 13,272.17 = 5,426.45 : x
2. Step 2: Convert to fraction form
   9,615.77/13,272.17 = 5,426.45/x
3. Step 3: Cross multiply
   9,615.77x = 13,272.17 × 5,426.45
4. Step 4: Simplify right side
   9,615.77x = 72,020,766.90
5. Step 5: Solve for x
   x = 72,020,766.90/9,615.77
6. Step 6: Final answer
   x = 7,489.86