Finding the Third Proportional to 57,749 and 86,387.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,749 : 86,387.50 = 86,387.50 : x
2. Step 2: Convert to fraction form
   57,749/86,387.50 = 86,387.50/x
3. Step 3: Cross multiply
   57,749x = 86,387.50 × 86,387.50
4. Step 4: Simplify right side
   57,749x = 7,462,800,156.25
5. Step 5: Solve for x
   x = 7,462,800,156.25/57,749
6. Step 6: Final answer
   x = 129,228.21