Finding the Third Proportional to 5,287.78 and 12,239.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,287.78 : 12,239.86 = 12,239.86 : x
2. Step 2: Convert to fraction form
   5,287.78/12,239.86 = 12,239.86/x
3. Step 3: Cross multiply
   5,287.78x = 12,239.86 × 12,239.86
4. Step 4: Simplify right side
   5,287.78x = 149,814,157.52
5. Step 5: Solve for x
   x = 149,814,157.52/5,287.78
6. Step 6: Final answer
   x = 28,332.14