Finding the Third Proportional to 58,770.50 and 86,920.50

Step by Step Solution

1. Step 1: Write the proportion equation
   58,770.50 : 86,920.50 = 86,920.50 : x
2. Step 2: Convert to fraction form
   58,770.50/86,920.50 = 86,920.50/x
3. Step 3: Cross multiply
   58,770.50x = 86,920.50 × 86,920.50
4. Step 4: Simplify right side
   58,770.50x = 7,555,173,320.25
5. Step 5: Solve for x
   x = 7,555,173,320.25/58,770.50
6. Step 6: Final answer
   x = 128,553.84