Finding the Fourth Proportional to 12,989.61, 19,465.56 and 5,583.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,989.61 : 19,465.56 = 5,583.57 : x
2. Step 2: Convert to fraction form
   12,989.61/19,465.56 = 5,583.57/x
3. Step 3: Cross multiply
   12,989.61x = 19,465.56 × 5,583.57
4. Step 4: Simplify right side
   12,989.61x = 108,687,316.85
5. Step 5: Solve for x
   x = 108,687,316.85/12,989.61
6. Step 6: Final answer
   x = 8,367.25