Finding the Fourth Proportional to 1,101.36, 1,518.16 and 864.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,101.36 : 1,518.16 = 864.72 : x
2. Step 2: Convert to fraction form
   1,101.36/1,518.16 = 864.72/x
3. Step 3: Cross multiply
   1,101.36x = 1,518.16 × 864.72
4. Step 4: Simplify right side
   1,101.36x = 1,312,783.32
5. Step 5: Solve for x
   x = 1,312,783.32/1,101.36
6. Step 6: Final answer
   x = 1,191.97