Finding the Fourth Proportional to 1,119.15, 1,679.76 and 807.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,119.15 : 1,679.76 = 807.12 : x
2. Step 2: Convert to fraction form
   1,119.15/1,679.76 = 807.12/x
3. Step 3: Cross multiply
   1,119.15x = 1,679.76 × 807.12
4. Step 4: Simplify right side
   1,119.15x = 1,355,767.89
5. Step 5: Solve for x
   x = 1,355,767.89/1,119.15
6. Step 6: Final answer
   x = 1,211.43