Finding the Third Proportional to 1,322.16 and 1,988.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,322.16 : 1,988.72 = 1,988.72 : x
2. Step 2: Convert to fraction form
   1,322.16/1,988.72 = 1,988.72/x
3. Step 3: Cross multiply
   1,322.16x = 1,988.72 × 1,988.72
4. Step 4: Simplify right side
   1,322.16x = 3,955,002.27
5. Step 5: Solve for x
   x = 3,955,002.27/1,322.16
6. Step 6: Final answer
   x = 2,991.33