Finding the Third Proportional to 126,129 and 187,396.50

Step by Step Solution

1. Step 1: Write the proportion equation
   126,129 : 187,396.50 = 187,396.50 : x
2. Step 2: Convert to fraction form
   126,129/187,396.50 = 187,396.50/x
3. Step 3: Cross multiply
   126,129x = 187,396.50 × 187,396.50
4. Step 4: Simplify right side
   126,129x = 35,117,448,212.25
5. Step 5: Solve for x
   x = 35,117,448,212.25/126,129
6. Step 6: Final answer
   x = 278,424.85