Finding the Third Proportional to 12,787.88 and 19,920.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,787.88 : 19,920.94 = 19,920.94 : x
2. Step 2: Convert to fraction form
   12,787.88/19,920.94 = 19,920.94/x
3. Step 3: Cross multiply
   12,787.88x = 19,920.94 × 19,920.94
4. Step 4: Simplify right side
   12,787.88x = 396,843,750.88
5. Step 5: Solve for x
   x = 396,843,750.88/12,787.88
6. Step 6: Final answer
   x = 31,032.81