Finding the Third Proportional to 642.94 and 1,015.88

Step by Step Solution

1. Step 1: Write the proportion equation
   642.94 : 1,015.88 = 1,015.88 : x
2. Step 2: Convert to fraction form
   642.94/1,015.88 = 1,015.88/x
3. Step 3: Cross multiply
   642.94x = 1,015.88 × 1,015.88
4. Step 4: Simplify right side
   642.94x = 1,032,002.02
5. Step 5: Solve for x
   x = 1,032,002.02/642.94
6. Step 6: Final answer
   x = 1,605.14