Finding the Fourth Proportional to 1,111.70, 1,665.72 and 494.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.70 : 1,665.72 = 494.48 : x
2. Step 2: Convert to fraction form
   1,111.70/1,665.72 = 494.48/x
3. Step 3: Cross multiply
   1,111.70x = 1,665.72 × 494.48
4. Step 4: Simplify right side
   1,111.70x = 823,656.90
5. Step 5: Solve for x
   x = 823,656.90/1,111.70
6. Step 6: Final answer
   x = 740.90