Finding the Fourth Proportional to 10,487.61, 15,726.81 and 5,556.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,487.61 : 15,726.81 = 5,556.12 : x
2. Step 2: Convert to fraction form
   10,487.61/15,726.81 = 5,556.12/x
3. Step 3: Cross multiply
   10,487.61x = 15,726.81 × 5,556.12
4. Step 4: Simplify right side
   10,487.61x = 87,380,018.42
5. Step 5: Solve for x
   x = 87,380,018.42/10,487.61
6. Step 6: Final answer
   x = 8,331.73