Finding the Fourth Proportional to 9,990.28, 14,969.86 and 5,819.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.28 : 14,969.86 = 5,819.98 : x
2. Step 2: Convert to fraction form
   9,990.28/14,969.86 = 5,819.98/x
3. Step 3: Cross multiply
   9,990.28x = 14,969.86 × 5,819.98
4. Step 4: Simplify right side
   9,990.28x = 87,124,285.80
5. Step 5: Solve for x
   x = 87,124,285.80/9,990.28
6. Step 6: Final answer
   x = 8,720.91