Finding the Fourth Proportional to 13,340.43, 20,013.89 and 3,980.07

Step by Step Solution

1. Step 1: Write the proportion equation
   13,340.43 : 20,013.89 = 3,980.07 : x
2. Step 2: Convert to fraction form
   13,340.43/20,013.89 = 3,980.07/x
3. Step 3: Cross multiply
   13,340.43x = 20,013.89 × 3,980.07
4. Step 4: Simplify right side
   13,340.43x = 79,656,663.27
5. Step 5: Solve for x
   x = 79,656,663.27/13,340.43
6. Step 6: Final answer
   x = 5,971.07