Finding the Fourth Proportional to 21,001.88, 31,503.42 and 5,419.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,001.88 : 31,503.42 = 5,419.50 : x
2. Step 2: Convert to fraction form
   21,001.88/31,503.42 = 5,419.50/x
3. Step 3: Cross multiply
   21,001.88x = 31,503.42 × 5,419.50
4. Step 4: Simplify right side
   21,001.88x = 170,732,784.69
5. Step 5: Solve for x
   x = 170,732,784.69/21,001.88
6. Step 6: Final answer
   x = 8,129.41