Finding the Fourth Proportional to 2,647.71, 3,971.52 and 916.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.71 : 3,971.52 = 916.29 : x
2. Step 2: Convert to fraction form
   2,647.71/3,971.52 = 916.29/x
3. Step 3: Cross multiply
   2,647.71x = 3,971.52 × 916.29
4. Step 4: Simplify right side
   2,647.71x = 3,639,064.06
5. Step 5: Solve for x
   x = 3,639,064.06/2,647.71
6. Step 6: Final answer
   x = 1,374.42