Finding the Third Proportional to 84,326.25 and 128,215.69

Step by Step Solution

1. Step 1: Write the proportion equation
   84,326.25 : 128,215.69 = 128,215.69 : x
2. Step 2: Convert to fraction form
   84,326.25/128,215.69 = 128,215.69/x
3. Step 3: Cross multiply
   84,326.25x = 128,215.69 × 128,215.69
4. Step 4: Simplify right side
   84,326.25x = 16,439,262,521.10
5. Step 5: Solve for x
   x = 16,439,262,521.10/84,326.25
6. Step 6: Final answer
   x = 194,948.34