Finding the Fourth Proportional to 10,830.56, 16,215.88 and 5,554.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,830.56 : 16,215.88 = 5,554.20 : x
2. Step 2: Convert to fraction form
   10,830.56/16,215.88 = 5,554.20/x
3. Step 3: Cross multiply
   10,830.56x = 16,215.88 × 5,554.20
4. Step 4: Simplify right side
   10,830.56x = 90,066,240.70
5. Step 5: Solve for x
   x = 90,066,240.70/10,830.56
6. Step 6: Final answer
   x = 8,315.94