Finding the Third Proportional to 978.50 and 1,560

Step by Step Solution

1. Step 1: Write the proportion equation
   978.50 : 1,560 = 1,560 : x
2. Step 2: Convert to fraction form
   978.50/1,560 = 1,560/x
3. Step 3: Cross multiply
   978.50x = 1,560 × 1,560
4. Step 4: Simplify right side
   978.50x = 2,433,600
5. Step 5: Solve for x
   x = 2,433,600/978.50
6. Step 6: Final answer
   x = 2,487.07