Finding the Fourth Proportional to 1,335.72, 1,843.80 and 918.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.72 : 1,843.80 = 918.24 : x
2. Step 2: Convert to fraction form
   1,335.72/1,843.80 = 918.24/x
3. Step 3: Cross multiply
   1,335.72x = 1,843.80 × 918.24
4. Step 4: Simplify right side
   1,335.72x = 1,693,050.91
5. Step 5: Solve for x
   x = 1,693,050.91/1,335.72
6. Step 6: Final answer
   x = 1,267.52