Finding the Fourth Proportional to 1,100.65, 1,518.32 and 891.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.65 : 1,518.32 = 891.06 : x
2. Step 2: Convert to fraction form
   1,100.65/1,518.32 = 891.06/x
3. Step 3: Cross multiply
   1,100.65x = 1,518.32 × 891.06
4. Step 4: Simplify right side
   1,100.65x = 1,352,909.76
5. Step 5: Solve for x
   x = 1,352,909.76/1,100.65
6. Step 6: Final answer
   x = 1,229.19