Finding the Third Proportional to 61,061.50 and 128,682.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,061.50 : 128,682.50 = 128,682.50 : x
2. Step 2: Convert to fraction form
   61,061.50/128,682.50 = 128,682.50/x
3. Step 3: Cross multiply
   61,061.50x = 128,682.50 × 128,682.50
4. Step 4: Simplify right side
   61,061.50x = 16,559,185,806.25
5. Step 5: Solve for x
   x = 16,559,185,806.25/61,061.50
6. Step 6: Final answer
   x = 271,188.65