Finding the Third Proportional to 2,191 and 3,390.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191 : 3,390.50 = 3,390.50 : x
2. Step 2: Convert to fraction form
   2,191/3,390.50 = 3,390.50/x
3. Step 3: Cross multiply
   2,191x = 3,390.50 × 3,390.50
4. Step 4: Simplify right side
   2,191x = 11,495,490.25
5. Step 5: Solve for x
   x = 11,495,490.25/2,191
6. Step 6: Final answer
   x = 5,246.69