Finding the Fourth Proportional to 1,128.22, 1,557.30 and 918.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.22 : 1,557.30 = 918.24 : x
2. Step 2: Convert to fraction form
   1,128.22/1,557.30 = 918.24/x
3. Step 3: Cross multiply
   1,128.22x = 1,557.30 × 918.24
4. Step 4: Simplify right side
   1,128.22x = 1,429,975.15
5. Step 5: Solve for x
   x = 1,429,975.15/1,128.22
6. Step 6: Final answer
   x = 1,267.46