Finding the Third Proportional to 1,172.81 and 1,690.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.81 : 1,690.03 = 1,690.03 : x
2. Step 2: Convert to fraction form
   1,172.81/1,690.03 = 1,690.03/x
3. Step 3: Cross multiply
   1,172.81x = 1,690.03 × 1,690.03
4. Step 4: Simplify right side
   1,172.81x = 2,856,205.63
5. Step 5: Solve for x
   x = 2,856,205.63/1,172.81
6. Step 6: Final answer
   x = 2,435.35