Finding the Third Proportional to 1,020 and 2,087.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020 : 2,087.50 = 2,087.50 : x
2. Step 2: Convert to fraction form
   1,020/2,087.50 = 2,087.50/x
3. Step 3: Cross multiply
   1,020x = 2,087.50 × 2,087.50
4. Step 4: Simplify right side
   1,020x = 4,357,656.25
5. Step 5: Solve for x
   x = 4,357,656.25/1,020
6. Step 6: Final answer
   x = 4,272.21