Finding the Fourth Proportional to 2,150.15, 3,223.89 and 916.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,150.15 : 3,223.89 = 916.85 : x
2. Step 2: Convert to fraction form
   2,150.15/3,223.89 = 916.85/x
3. Step 3: Cross multiply
   2,150.15x = 3,223.89 × 916.85
4. Step 4: Simplify right side
   2,150.15x = 2,955,807.43
5. Step 5: Solve for x
   x = 2,955,807.43/2,150.15
6. Step 6: Final answer
   x = 1,374.70