Finding the Fourth Proportional to 1,003.49, 1,386.15 and 807.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.49 : 1,386.15 = 807.74 : x
2. Step 2: Convert to fraction form
   1,003.49/1,386.15 = 807.74/x
3. Step 3: Cross multiply
   1,003.49x = 1,386.15 × 807.74
4. Step 4: Simplify right side
   1,003.49x = 1,119,648.80
5. Step 5: Solve for x
   x = 1,119,648.80/1,003.49
6. Step 6: Final answer
   x = 1,115.75