Finding the Third Proportional to 656.16 and 1,387.69

Step by Step Solution

1. Step 1: Write the proportion equation
   656.16 : 1,387.69 = 1,387.69 : x
2. Step 2: Convert to fraction form
   656.16/1,387.69 = 1,387.69/x
3. Step 3: Cross multiply
   656.16x = 1,387.69 × 1,387.69
4. Step 4: Simplify right side
   656.16x = 1,925,676.60
5. Step 5: Solve for x
   x = 1,925,676.60/656.16
6. Step 6: Final answer
   x = 2,934.78