Finding the Third Proportional to 961.50 and 2,139

Step by Step Solution

1. Step 1: Write the proportion equation
   961.50 : 2,139 = 2,139 : x
2. Step 2: Convert to fraction form
   961.50/2,139 = 2,139/x
3. Step 3: Cross multiply
   961.50x = 2,139 × 2,139
4. Step 4: Simplify right side
   961.50x = 4,575,321
5. Step 5: Solve for x
   x = 4,575,321/961.50
6. Step 6: Final answer
   x = 4,758.52