Finding the Fourth Proportional to 8,613.40, 12,903.90 and 8,030.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,613.40 : 12,903.90 = 8,030.20 : x
2. Step 2: Convert to fraction form
   8,613.40/12,903.90 = 8,030.20/x
3. Step 3: Cross multiply
   8,613.40x = 12,903.90 × 8,030.20
4. Step 4: Simplify right side
   8,613.40x = 103,620,897.78
5. Step 5: Solve for x
   x = 103,620,897.78/8,613.40
6. Step 6: Final answer
   x = 12,030.20