Finding the Fourth Proportional to 10,384.56, 15,579.81 and 5,121.15

Step by Step Solution

1. Step 1: Write the proportion equation
   10,384.56 : 15,579.81 = 5,121.15 : x
2. Step 2: Convert to fraction form
   10,384.56/15,579.81 = 5,121.15/x
3. Step 3: Cross multiply
   10,384.56x = 15,579.81 × 5,121.15
4. Step 4: Simplify right side
   10,384.56x = 79,786,543.98
5. Step 5: Solve for x
   x = 79,786,543.98/10,384.56
6. Step 6: Final answer
   x = 7,683.19