Finding the Fourth Proportional to 21,742.88, 30,023.56 and 13,799.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,742.88 : 30,023.56 = 13,799.20 : x
2. Step 2: Convert to fraction form
   21,742.88/30,023.56 = 13,799.20/x
3. Step 3: Cross multiply
   21,742.88x = 30,023.56 × 13,799.20
4. Step 4: Simplify right side
   21,742.88x = 414,301,109.15
5. Step 5: Solve for x
   x = 414,301,109.15/21,742.88
6. Step 6: Final answer
   x = 19,054.56