Finding the Third Proportional to 2,100 and 3,151.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100 : 3,151.50 = 3,151.50 : x
2. Step 2: Convert to fraction form
   2,100/3,151.50 = 3,151.50/x
3. Step 3: Cross multiply
   2,100x = 3,151.50 × 3,151.50
4. Step 4: Simplify right side
   2,100x = 9,931,952.25
5. Step 5: Solve for x
   x = 9,931,952.25/2,100
6. Step 6: Final answer
   x = 4,729.50