Finding the Fourth Proportional to 8,271.50, 12,407.31 and 2,428.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,271.50 : 12,407.31 = 2,428.20 : x
2. Step 2: Convert to fraction form
   8,271.50/12,407.31 = 2,428.20/x
3. Step 3: Cross multiply
   8,271.50x = 12,407.31 × 2,428.20
4. Step 4: Simplify right side
   8,271.50x = 30,127,430.14
5. Step 5: Solve for x
   x = 30,127,430.14/8,271.50
6. Step 6: Final answer
   x = 3,642.32