Finding the Third Proportional to 1,211.50 and 1,878

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211.50 : 1,878 = 1,878 : x
2. Step 2: Convert to fraction form
   1,211.50/1,878 = 1,878/x
3. Step 3: Cross multiply
   1,211.50x = 1,878 × 1,878
4. Step 4: Simplify right side
   1,211.50x = 3,526,884
5. Step 5: Solve for x
   x = 3,526,884/1,211.50
6. Step 6: Final answer
   x = 2,911.17