Finding the Fourth Proportional to 1,665.72, 2,498.31 and 936.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.72 : 2,498.31 = 936.72 : x
2. Step 2: Convert to fraction form
   1,665.72/2,498.31 = 936.72/x
3. Step 3: Cross multiply
   1,665.72x = 2,498.31 × 936.72
4. Step 4: Simplify right side
   1,665.72x = 2,340,216.94
5. Step 5: Solve for x
   x = 2,340,216.94/1,665.72
6. Step 6: Final answer
   x = 1,404.93