Finding the Fourth Proportional to 10,990, 16,486.72 and 3,592.88

Step by Step Solution

1. Step 1: Write the proportion equation
   10,990 : 16,486.72 = 3,592.88 : x
2. Step 2: Convert to fraction form
   10,990/16,486.72 = 3,592.88/x
3. Step 3: Cross multiply
   10,990x = 16,486.72 × 3,592.88
4. Step 4: Simplify right side
   10,990x = 59,234,806.55
5. Step 5: Solve for x
   x = 59,234,806.55/10,990
6. Step 6: Final answer
   x = 5,389.88