Finding the Fourth Proportional to 15,881.35, 21,851.89 and 13,038.25

Step by Step Solution

1. Step 1: Write the proportion equation
   15,881.35 : 21,851.89 = 13,038.25 : x
2. Step 2: Convert to fraction form
   15,881.35/21,851.89 = 13,038.25/x
3. Step 3: Cross multiply
   15,881.35x = 21,851.89 × 13,038.25
4. Step 4: Simplify right side
   15,881.35x = 284,910,404.79
5. Step 5: Solve for x
   x = 284,910,404.79/15,881.35
6. Step 6: Final answer
   x = 17,939.94