Finding the Third Proportional to 988.50 and 2,111.25

Step by Step Solution

1. Step 1: Write the proportion equation
   988.50 : 2,111.25 = 2,111.25 : x
2. Step 2: Convert to fraction form
   988.50/2,111.25 = 2,111.25/x
3. Step 3: Cross multiply
   988.50x = 2,111.25 × 2,111.25
4. Step 4: Simplify right side
   988.50x = 4,457,376.56
5. Step 5: Solve for x
   x = 4,457,376.56/988.50
6. Step 6: Final answer
   x = 4,509.23