Finding the Fourth Proportional to 2,086.43, 3,130.52 and 916.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.43 : 3,130.52 = 916.70 : x
2. Step 2: Convert to fraction form
   2,086.43/3,130.52 = 916.70/x
3. Step 3: Cross multiply
   2,086.43x = 3,130.52 × 916.70
4. Step 4: Simplify right side
   2,086.43x = 2,869,727.45
5. Step 5: Solve for x
   x = 2,869,727.45/2,086.43
6. Step 6: Final answer
   x = 1,375.43