Finding the Fourth Proportional to 10,389.05, 15,570.60 and 5,196.41

Step by Step Solution

1. Step 1: Write the proportion equation
   10,389.05 : 15,570.60 = 5,196.41 : x
2. Step 2: Convert to fraction form
   10,389.05/15,570.60 = 5,196.41/x
3. Step 3: Cross multiply
   10,389.05x = 15,570.60 × 5,196.41
4. Step 4: Simplify right side
   10,389.05x = 80,911,221.55
5. Step 5: Solve for x
   x = 80,911,221.55/10,389.05
6. Step 6: Final answer
   x = 7,788.13