Finding the Third Proportional to 5,981.50 and 12,999.55

Step by Step Solution

1. Step 1: Write the proportion equation
   5,981.50 : 12,999.55 = 12,999.55 : x
2. Step 2: Convert to fraction form
   5,981.50/12,999.55 = 12,999.55/x
3. Step 3: Cross multiply
   5,981.50x = 12,999.55 × 12,999.55
4. Step 4: Simplify right side
   5,981.50x = 168,988,320.51
5. Step 5: Solve for x
   x = 168,988,320.51/5,981.50
6. Step 6: Final answer
   x = 28,251.82