Finding the Third Proportional to 12,129 and 25,726.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,129 : 25,726.50 = 25,726.50 : x
2. Step 2: Convert to fraction form
   12,129/25,726.50 = 25,726.50/x
3. Step 3: Cross multiply
   12,129x = 25,726.50 × 25,726.50
4. Step 4: Simplify right side
   12,129x = 661,852,802.25
5. Step 5: Solve for x
   x = 661,852,802.25/12,129
6. Step 6: Final answer
   x = 54,567.80