Finding the Fourth Proportional to 1,225.31, 1,691.49 and 783.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225.31 : 1,691.49 = 783.82 : x
2. Step 2: Convert to fraction form
   1,225.31/1,691.49 = 783.82/x
3. Step 3: Cross multiply
   1,225.31x = 1,691.49 × 783.82
4. Step 4: Simplify right side
   1,225.31x = 1,325,815.23
5. Step 5: Solve for x
   x = 1,325,815.23/1,225.31
6. Step 6: Final answer
   x = 1,082.02