Finding the Fourth Proportional to 13,767.74, 20,505.89 and 13,700.62

Step by Step Solution

1. Step 1: Write the proportion equation
   13,767.74 : 20,505.89 = 13,700.62 : x
2. Step 2: Convert to fraction form
   13,767.74/20,505.89 = 13,700.62/x
3. Step 3: Cross multiply
   13,767.74x = 20,505.89 × 13,700.62
4. Step 4: Simplify right side
   13,767.74x = 280,943,406.65
5. Step 5: Solve for x
   x = 280,943,406.65/13,767.74
6. Step 6: Final answer
   x = 20,405.92