Finding the Fourth Proportional to 10,143.45, 13,997.91 and 5,667.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,143.45 : 13,997.91 = 5,667.21 : x
2. Step 2: Convert to fraction form
   10,143.45/13,997.91 = 5,667.21/x
3. Step 3: Cross multiply
   10,143.45x = 13,997.91 × 5,667.21
4. Step 4: Simplify right side
   10,143.45x = 79,329,095.53
5. Step 5: Solve for x
   x = 79,329,095.53/10,143.45
6. Step 6: Final answer
   x = 7,820.72