Finding the Fourth Proportional to 21,131.52, 31,511.28 and 19,654.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.52 : 31,511.28 = 19,654.08 : x
2. Step 2: Convert to fraction form
   21,131.52/31,511.28 = 19,654.08/x
3. Step 3: Cross multiply
   21,131.52x = 31,511.28 × 19,654.08
4. Step 4: Simplify right side
   21,131.52x = 619,325,218.02
5. Step 5: Solve for x
   x = 619,325,218.02/21,131.52
6. Step 6: Final answer
   x = 29,308.12