Finding the Fourth Proportional to 1,142.81, 1,576.61 and 807.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.81 : 1,576.61 = 807.19 : x
2. Step 2: Convert to fraction form
   1,142.81/1,576.61 = 807.19/x
3. Step 3: Cross multiply
   1,142.81x = 1,576.61 × 807.19
4. Step 4: Simplify right side
   1,142.81x = 1,272,623.83
5. Step 5: Solve for x
   x = 1,272,623.83/1,142.81
6. Step 6: Final answer
   x = 1,113.59