Finding the Third Proportional to 905 and 2,099.50

Step by Step Solution

1. Step 1: Write the proportion equation
   905 : 2,099.50 = 2,099.50 : x
2. Step 2: Convert to fraction form
   905/2,099.50 = 2,099.50/x
3. Step 3: Cross multiply
   905x = 2,099.50 × 2,099.50
4. Step 4: Simplify right side
   905x = 4,407,900.25
5. Step 5: Solve for x
   x = 4,407,900.25/905
6. Step 6: Final answer
   x = 4,870.61