Finding the Third Proportional to 59,989.50 and 85,729.50

Step by Step Solution

1. Step 1: Write the proportion equation
   59,989.50 : 85,729.50 = 85,729.50 : x
2. Step 2: Convert to fraction form
   59,989.50/85,729.50 = 85,729.50/x
3. Step 3: Cross multiply
   59,989.50x = 85,729.50 × 85,729.50
4. Step 4: Simplify right side
   59,989.50x = 7,349,547,170.25
5. Step 5: Solve for x
   x = 7,349,547,170.25/59,989.50
6. Step 6: Final answer
   x = 122,513.89