Finding the Fourth Proportional to 2,426.45, 3,640.17 and 783.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,426.45 : 3,640.17 = 783.15 : x
2. Step 2: Convert to fraction form
   2,426.45/3,640.17 = 783.15/x
3. Step 3: Cross multiply
   2,426.45x = 3,640.17 × 783.15
4. Step 4: Simplify right side
   2,426.45x = 2,850,799.14
5. Step 5: Solve for x
   x = 2,850,799.14/2,426.45
6. Step 6: Final answer
   x = 1,174.89