Finding the Fourth Proportional to 10,142.21, 13,991.33 and 7,151.49

Step by Step Solution

1. Step 1: Write the proportion equation
   10,142.21 : 13,991.33 = 7,151.49 : x
2. Step 2: Convert to fraction form
   10,142.21/13,991.33 = 7,151.49/x
3. Step 3: Cross multiply
   10,142.21x = 13,991.33 × 7,151.49
4. Step 4: Simplify right side
   10,142.21x = 100,058,874.46
5. Step 5: Solve for x
   x = 100,058,874.46/10,142.21
6. Step 6: Final answer
   x = 9,865.59