Finding the Fourth Proportional to 9,979.71, 13,772.09 and 5,503.62

Step by Step Solution

1. Step 1: Write the proportion equation
   9,979.71 : 13,772.09 = 5,503.62 : x
2. Step 2: Convert to fraction form
   9,979.71/13,772.09 = 5,503.62/x
3. Step 3: Cross multiply
   9,979.71x = 13,772.09 × 5,503.62
4. Step 4: Simplify right side
   9,979.71x = 75,796,363.72
5. Step 5: Solve for x
   x = 75,796,363.72/9,979.71
6. Step 6: Final answer
   x = 7,595.05