Finding the Third Proportional to 7,799.25 and 12,121.88

Step by Step Solution

1. Step 1: Write the proportion equation
   7,799.25 : 12,121.88 = 12,121.88 : x
2. Step 2: Convert to fraction form
   7,799.25/12,121.88 = 12,121.88/x
3. Step 3: Cross multiply
   7,799.25x = 12,121.88 × 12,121.88
4. Step 4: Simplify right side
   7,799.25x = 146,939,853.52
5. Step 5: Solve for x
   x = 146,939,853.52/7,799.25
6. Step 6: Final answer
   x = 18,840.25