Finding the Fourth Proportional to 1,367.12, 1,886.18 and 807.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.12 : 1,886.18 = 807.40 : x
2. Step 2: Convert to fraction form
   1,367.12/1,886.18 = 807.40/x
3. Step 3: Cross multiply
   1,367.12x = 1,886.18 × 807.40
4. Step 4: Simplify right side
   1,367.12x = 1,522,901.73
5. Step 5: Solve for x
   x = 1,522,901.73/1,367.12
6. Step 6: Final answer
   x = 1,113.95