Finding the Third Proportional to 57,639 and 86,092.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,639 : 86,092.50 = 86,092.50 : x
2. Step 2: Convert to fraction form
   57,639/86,092.50 = 86,092.50/x
3. Step 3: Cross multiply
   57,639x = 86,092.50 × 86,092.50
4. Step 4: Simplify right side
   57,639x = 7,411,918,556.25
5. Step 5: Solve for x
   x = 7,411,918,556.25/57,639
6. Step 6: Final answer
   x = 128,592.07