Finding the Fourth Proportional to 9,158.15, 12,638.09 and 5,571.81

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158.15 : 12,638.09 = 5,571.81 : x
2. Step 2: Convert to fraction form
   9,158.15/12,638.09 = 5,571.81/x
3. Step 3: Cross multiply
   9,158.15x = 12,638.09 × 5,571.81
4. Step 4: Simplify right side
   9,158.15x = 70,417,050.17
5. Step 5: Solve for x
   x = 70,417,050.17/9,158.15
6. Step 6: Final answer
   x = 7,689.00