Finding the Third Proportional to 1,211.63 and 1,991.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211.63 : 1,991.25 = 1,991.25 : x
2. Step 2: Convert to fraction form
   1,211.63/1,991.25 = 1,991.25/x
3. Step 3: Cross multiply
   1,211.63x = 1,991.25 × 1,991.25
4. Step 4: Simplify right side
   1,211.63x = 3,965,076.56
5. Step 5: Solve for x
   x = 3,965,076.56/1,211.63
6. Step 6: Final answer
   x = 3,272.53