Finding the Fourth Proportional to 2,647.50, 3,971.52 and 916.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.50 : 3,971.52 = 916.12 : x
2. Step 2: Convert to fraction form
   2,647.50/3,971.52 = 916.12/x
3. Step 3: Cross multiply
   2,647.50x = 3,971.52 × 916.12
4. Step 4: Simplify right side
   2,647.50x = 3,638,388.90
5. Step 5: Solve for x
   x = 3,638,388.90/2,647.50
6. Step 6: Final answer
   x = 1,374.27