Finding the Fourth Proportional to 9,411.94, 12,988.11 and 5,220.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,411.94 : 12,988.11 = 5,220.10 : x
2. Step 2: Convert to fraction form
   9,411.94/12,988.11 = 5,220.10/x
3. Step 3: Cross multiply
   9,411.94x = 12,988.11 × 5,220.10
4. Step 4: Simplify right side
   9,411.94x = 67,799,233.01
5. Step 5: Solve for x
   x = 67,799,233.01/9,411.94
6. Step 6: Final answer
   x = 7,203.53