Finding the Third Proportional to 54,358.88 and 86,479.31

Step by Step Solution

1. Step 1: Write the proportion equation
   54,358.88 : 86,479.31 = 86,479.31 : x
2. Step 2: Convert to fraction form
   54,358.88/86,479.31 = 86,479.31/x
3. Step 3: Cross multiply
   54,358.88x = 86,479.31 × 86,479.31
4. Step 4: Simplify right side
   54,358.88x = 7,478,671,490.47
5. Step 5: Solve for x
   x = 7,478,671,490.47/54,358.88
6. Step 6: Final answer
   x = 137,579.59