Finding the Fourth Proportional to 2,085.78, 3,128.27 and 916.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.78 : 3,128.27 = 916.14 : x
2. Step 2: Convert to fraction form
   2,085.78/3,128.27 = 916.14/x
3. Step 3: Cross multiply
   2,085.78x = 3,128.27 × 916.14
4. Step 4: Simplify right side
   2,085.78x = 2,865,928.70
5. Step 5: Solve for x
   x = 2,865,928.70/2,085.78
6. Step 6: Final answer
   x = 1,374.03