Finding the Fourth Proportional to 2,647.98, 3,972.15 and 916.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.98 : 3,972.15 = 916.02 : x
2. Step 2: Convert to fraction form
   2,647.98/3,972.15 = 916.02/x
3. Step 3: Cross multiply
   2,647.98x = 3,972.15 × 916.02
4. Step 4: Simplify right side
   2,647.98x = 3,638,568.84
5. Step 5: Solve for x
   x = 3,638,568.84/2,647.98
6. Step 6: Final answer
   x = 1,374.09