Finding the Fourth Proportional to 9,919.50, 13,688.91 and 5,503.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,919.50 : 13,688.91 = 5,503.50 : x
2. Step 2: Convert to fraction form
   9,919.50/13,688.91 = 5,503.50/x
3. Step 3: Cross multiply
   9,919.50x = 13,688.91 × 5,503.50
4. Step 4: Simplify right side
   9,919.50x = 75,336,916.19
5. Step 5: Solve for x
   x = 75,336,916.19/9,919.50
6. Step 6: Final answer
   x = 7,594.83