Finding the Fourth Proportional to 1,111.70, 1,665.71 and 997.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.70 : 1,665.71 = 997.24 : x
2. Step 2: Convert to fraction form
   1,111.70/1,665.71 = 997.24/x
3. Step 3: Cross multiply
   1,111.70x = 1,665.71 × 997.24
4. Step 4: Simplify right side
   1,111.70x = 1,661,112.64
5. Step 5: Solve for x
   x = 1,661,112.64/1,111.70
6. Step 6: Final answer
   x = 1,494.21