Finding the Third Proportional to 3,291.75 and 7,870.13

Step by Step Solution

1. Step 1: Write the proportion equation
   3,291.75 : 7,870.13 = 7,870.13 : x
2. Step 2: Convert to fraction form
   3,291.75/7,870.13 = 7,870.13/x
3. Step 3: Cross multiply
   3,291.75x = 7,870.13 × 7,870.13
4. Step 4: Simplify right side
   3,291.75x = 61,938,867.52
5. Step 5: Solve for x
   x = 61,938,867.52/3,291.75
6. Step 6: Final answer
   x = 18,816.39