Finding the Third Proportional to 86,308.88 and 137,392.88

Step by Step Solution

1. Step 1: Write the proportion equation
   86,308.88 : 137,392.88 = 137,392.88 : x
2. Step 2: Convert to fraction form
   86,308.88/137,392.88 = 137,392.88/x
3. Step 3: Cross multiply
   86,308.88x = 137,392.88 × 137,392.88
4. Step 4: Simplify right side
   86,308.88x = 18,876,802,100.77
5. Step 5: Solve for x
   x = 18,876,802,100.77/86,308.88
6. Step 6: Final answer
   x = 218,712.18