Finding the Third Proportional to 61,290 and 128,194.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,290 : 128,194.50 = 128,194.50 : x
2. Step 2: Convert to fraction form
   61,290/128,194.50 = 128,194.50/x
3. Step 3: Cross multiply
   61,290x = 128,194.50 × 128,194.50
4. Step 4: Simplify right side
   61,290x = 16,433,829,830.25
5. Step 5: Solve for x
   x = 16,433,829,830.25/61,290
6. Step 6: Final answer
   x = 268,132.32