Finding the Fourth Proportional to 1,079.33, 1,487.06 and 891.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.33 : 1,487.06 = 891.81 : x
2. Step 2: Convert to fraction form
   1,079.33/1,487.06 = 891.81/x
3. Step 3: Cross multiply
   1,079.33x = 1,487.06 × 891.81
4. Step 4: Simplify right side
   1,079.33x = 1,326,173.86
5. Step 5: Solve for x
   x = 1,326,173.86/1,079.33
6. Step 6: Final answer
   x = 1,228.71