Finding the Third Proportional to 57,480 and 86,296.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,480 : 86,296.50 = 86,296.50 : x
2. Step 2: Convert to fraction form
   57,480/86,296.50 = 86,296.50/x
3. Step 3: Cross multiply
   57,480x = 86,296.50 × 86,296.50
4. Step 4: Simplify right side
   57,480x = 7,447,085,912.25
5. Step 5: Solve for x
   x = 7,447,085,912.25/57,480
6. Step 6: Final answer
   x = 129,559.60