Finding the Third Proportional to 691.63 and 1,072.50

Step by Step Solution

1. Step 1: Write the proportion equation
   691.63 : 1,072.50 = 1,072.50 : x
2. Step 2: Convert to fraction form
   691.63/1,072.50 = 1,072.50/x
3. Step 3: Cross multiply
   691.63x = 1,072.50 × 1,072.50
4. Step 4: Simplify right side
   691.63x = 1,150,256.25
5. Step 5: Solve for x
   x = 1,150,256.25/691.63
6. Step 6: Final answer
   x = 1,663.12