Finding the Fourth Proportional to 10,575.72, 15,879.12 and 10,389.08

Step by Step Solution

1. Step 1: Write the proportion equation
   10,575.72 : 15,879.12 = 10,389.08 : x
2. Step 2: Convert to fraction form
   10,575.72/15,879.12 = 10,389.08/x
3. Step 3: Cross multiply
   10,575.72x = 15,879.12 × 10,389.08
4. Step 4: Simplify right side
   10,575.72x = 164,969,448.01
5. Step 5: Solve for x
   x = 164,969,448.01/10,575.72
6. Step 6: Final answer
   x = 15,598.89