Finding the Third Proportional to 121,393.69 and 259,417.69

Step by Step Solution

1. Step 1: Write the proportion equation
   121,393.69 : 259,417.69 = 259,417.69 : x
2. Step 2: Convert to fraction form
   121,393.69/259,417.69 = 259,417.69/x
3. Step 3: Cross multiply
   121,393.69x = 259,417.69 × 259,417.69
4. Step 4: Simplify right side
   121,393.69x = 67,297,536,587.85
5. Step 5: Solve for x
   x = 67,297,536,587.85/121,393.69
6. Step 6: Final answer
   x = 554,374.27