Finding the Fourth Proportional to 1,092.72, 1,641.18 and 936.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.72 : 1,641.18 = 936.90 : x
2. Step 2: Convert to fraction form
   1,092.72/1,641.18 = 936.90/x
3. Step 3: Cross multiply
   1,092.72x = 1,641.18 × 936.90
4. Step 4: Simplify right side
   1,092.72x = 1,537,621.54
5. Step 5: Solve for x
   x = 1,537,621.54/1,092.72
6. Step 6: Final answer
   x = 1,407.15