Finding the Third Proportional to 60,138 and 128,317.50

Step by Step Solution

1. Step 1: Write the proportion equation
   60,138 : 128,317.50 = 128,317.50 : x
2. Step 2: Convert to fraction form
   60,138/128,317.50 = 128,317.50/x
3. Step 3: Cross multiply
   60,138x = 128,317.50 × 128,317.50
4. Step 4: Simplify right side
   60,138x = 16,465,380,806.25
5. Step 5: Solve for x
   x = 16,465,380,806.25/60,138
6. Step 6: Final answer
   x = 273,793.29