Finding the Fourth Proportional to 21,789.60, 30,039.76 and 19,575.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,789.60 : 30,039.76 = 19,575.36 : x
2. Step 2: Convert to fraction form
   21,789.60/30,039.76 = 19,575.36/x
3. Step 3: Cross multiply
   21,789.60x = 30,039.76 × 19,575.36
4. Step 4: Simplify right side
   21,789.60x = 588,039,116.31
5. Step 5: Solve for x
   x = 588,039,116.31/21,789.60
6. Step 6: Final answer
   x = 26,987.15