Finding the Third Proportional to 840.38 and 1,151.72

Step by Step Solution

1. Step 1: Write the proportion equation
   840.38 : 1,151.72 = 1,151.72 : x
2. Step 2: Convert to fraction form
   840.38/1,151.72 = 1,151.72/x
3. Step 3: Cross multiply
   840.38x = 1,151.72 × 1,151.72
4. Step 4: Simplify right side
   840.38x = 1,326,456.08
5. Step 5: Solve for x
   x = 1,326,456.08/840.38
6. Step 6: Final answer
   x = 1,578.41