Finding the Fourth Proportional to 10,381.72, 15,570.96 and 4,142.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,381.72 : 15,570.96 = 4,142.56 : x
2. Step 2: Convert to fraction form
   10,381.72/15,570.96 = 4,142.56/x
3. Step 3: Cross multiply
   10,381.72x = 15,570.96 × 4,142.56
4. Step 4: Simplify right side
   10,381.72x = 64,503,636.06
5. Step 5: Solve for x
   x = 64,503,636.06/10,381.72
6. Step 6: Final answer
   x = 6,213.19