Finding the Third Proportional to 8,918.86 and 13,839.61

Step by Step Solution

1. Step 1: Write the proportion equation
   8,918.86 : 13,839.61 = 13,839.61 : x
2. Step 2: Convert to fraction form
   8,918.86/13,839.61 = 13,839.61/x
3. Step 3: Cross multiply
   8,918.86x = 13,839.61 × 13,839.61
4. Step 4: Simplify right side
   8,918.86x = 191,534,787.65
5. Step 5: Solve for x
   x = 191,534,787.65/8,918.86
6. Step 6: Final answer
   x = 21,475.26