Finding the Third Proportional to 931.50 and 1,718.72

Step by Step Solution

1. Step 1: Write the proportion equation
   931.50 : 1,718.72 = 1,718.72 : x
2. Step 2: Convert to fraction form
   931.50/1,718.72 = 1,718.72/x
3. Step 3: Cross multiply
   931.50x = 1,718.72 × 1,718.72
4. Step 4: Simplify right side
   931.50x = 2,953,994.14
5. Step 5: Solve for x
   x = 2,953,994.14/931.50
6. Step 6: Final answer
   x = 3,171.22