Finding the Fourth Proportional to 20,540.61, 28,296.89 and 19,540.06

Step by Step Solution

1. Step 1: Write the proportion equation
   20,540.61 : 28,296.89 = 19,540.06 : x
2. Step 2: Convert to fraction form
   20,540.61/28,296.89 = 19,540.06/x
3. Step 3: Cross multiply
   20,540.61x = 28,296.89 × 19,540.06
4. Step 4: Simplify right side
   20,540.61x = 552,922,928.41
5. Step 5: Solve for x
   x = 552,922,928.41/20,540.61
6. Step 6: Final answer
   x = 26,918.53