Finding the Fourth Proportional to 1,079.61, 1,490.47 and 866.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.61 : 1,490.47 = 866.38 : x
2. Step 2: Convert to fraction form
   1,079.61/1,490.47 = 866.38/x
3. Step 3: Cross multiply
   1,079.61x = 1,490.47 × 866.38
4. Step 4: Simplify right side
   1,079.61x = 1,291,301.61
5. Step 5: Solve for x
   x = 1,291,301.61/1,079.61
6. Step 6: Final answer
   x = 1,196.09