Finding the Fourth Proportional to 21,881.89, 30,133.47 and 19,009.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,881.89 : 30,133.47 = 19,009.31 : x
2. Step 2: Convert to fraction form
   21,881.89/30,133.47 = 19,009.31/x
3. Step 3: Cross multiply
   21,881.89x = 30,133.47 × 19,009.31
4. Step 4: Simplify right side
   21,881.89x = 572,816,472.61
5. Step 5: Solve for x
   x = 572,816,472.61/21,881.89
6. Step 6: Final answer
   x = 26,177.65