Finding the Fourth Proportional to 8,648.39, 12,971.28 and 2,407.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,648.39 : 12,971.28 = 2,407.76 : x
2. Step 2: Convert to fraction form
   8,648.39/12,971.28 = 2,407.76/x
3. Step 3: Cross multiply
   8,648.39x = 12,971.28 × 2,407.76
4. Step 4: Simplify right side
   8,648.39x = 31,231,770.59
5. Step 5: Solve for x
   x = 31,231,770.59/8,648.39
6. Step 6: Final answer
   x = 3,611.28