Finding the Fourth Proportional to 9,979.91, 13,772.05 and 5,503.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,979.91 : 13,772.05 = 5,503.58 : x
2. Step 2: Convert to fraction form
   9,979.91/13,772.05 = 5,503.58/x
3. Step 3: Cross multiply
   9,979.91x = 13,772.05 × 5,503.58
4. Step 4: Simplify right side
   9,979.91x = 75,795,578.94
5. Step 5: Solve for x
   x = 75,795,578.94/9,979.91
6. Step 6: Final answer
   x = 7,594.82