Finding the Third Proportional to 129,078 and 277,931.25

Step by Step Solution

1. Step 1: Write the proportion equation
   129,078 : 277,931.25 = 277,931.25 : x
2. Step 2: Convert to fraction form
   129,078/277,931.25 = 277,931.25/x
3. Step 3: Cross multiply
   129,078x = 277,931.25 × 277,931.25
4. Step 4: Simplify right side
   129,078x = 77,245,779,726.56
5. Step 5: Solve for x
   x = 77,245,779,726.56/129,078
6. Step 6: Final answer
   x = 598,442.64