Finding the Third Proportional to 659.50 and 987.50

Step by Step Solution

1. Step 1: Write the proportion equation
   659.50 : 987.50 = 987.50 : x
2. Step 2: Convert to fraction form
   659.50/987.50 = 987.50/x
3. Step 3: Cross multiply
   659.50x = 987.50 × 987.50
4. Step 4: Simplify right side
   659.50x = 975,156.25
5. Step 5: Solve for x
   x = 975,156.25/659.50
6. Step 6: Final answer
   x = 1,478.63