Finding the Third Proportional to 69,128 and 141,171.50

Step by Step Solution

1. Step 1: Write the proportion equation
   69,128 : 141,171.50 = 141,171.50 : x
2. Step 2: Convert to fraction form
   69,128/141,171.50 = 141,171.50/x
3. Step 3: Cross multiply
   69,128x = 141,171.50 × 141,171.50
4. Step 4: Simplify right side
   69,128x = 19,929,392,412.25
5. Step 5: Solve for x
   x = 19,929,392,412.25/69,128
6. Step 6: Final answer
   x = 288,296.96