Finding the Third Proportional to 870.50 and 1,872.50

Step by Step Solution

1. Step 1: Write the proportion equation
   870.50 : 1,872.50 = 1,872.50 : x
2. Step 2: Convert to fraction form
   870.50/1,872.50 = 1,872.50/x
3. Step 3: Cross multiply
   870.50x = 1,872.50 × 1,872.50
4. Step 4: Simplify right side
   870.50x = 3,506,256.25
5. Step 5: Solve for x
   x = 3,506,256.25/870.50
6. Step 6: Final answer
   x = 4,027.86