Finding the Fourth Proportional to 13,722.51, 20,578.61 and 5,397.98

Step by Step Solution

1. Step 1: Write the proportion equation
   13,722.51 : 20,578.61 = 5,397.98 : x
2. Step 2: Convert to fraction form
   13,722.51/20,578.61 = 5,397.98/x
3. Step 3: Cross multiply
   13,722.51x = 20,578.61 × 5,397.98
4. Step 4: Simplify right side
   13,722.51x = 111,082,892.26
5. Step 5: Solve for x
   x = 111,082,892.26/13,722.51
6. Step 6: Final answer
   x = 8,094.94