Finding the Fourth Proportional to 2,648.84, 3,972.06 and 916.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.84 : 3,972.06 = 916.24 : x
2. Step 2: Convert to fraction form
   2,648.84/3,972.06 = 916.24/x
3. Step 3: Cross multiply
   2,648.84x = 3,972.06 × 916.24
4. Step 4: Simplify right side
   2,648.84x = 3,639,360.25
5. Step 5: Solve for x
   x = 3,639,360.25/2,648.84
6. Step 6: Final answer
   x = 1,373.94