Finding the Third Proportional to 6,990 and 13,291.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,990 : 13,291.50 = 13,291.50 : x
2. Step 2: Convert to fraction form
   6,990/13,291.50 = 13,291.50/x
3. Step 3: Cross multiply
   6,990x = 13,291.50 × 13,291.50
4. Step 4: Simplify right side
   6,990x = 176,663,972.25
5. Step 5: Solve for x
   x = 176,663,972.25/6,990
6. Step 6: Final answer
   x = 25,273.82