Finding the Fourth Proportional to 1,343.89, 1,854.39 and 784.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,343.89 : 1,854.39 = 784.28 : x
2. Step 2: Convert to fraction form
   1,343.89/1,854.39 = 784.28/x
3. Step 3: Cross multiply
   1,343.89x = 1,854.39 × 784.28
4. Step 4: Simplify right side
   1,343.89x = 1,454,368.57
5. Step 5: Solve for x
   x = 1,454,368.57/1,343.89
6. Step 6: Final answer
   x = 1,082.21