Finding the Fourth Proportional to 9,919.55, 13,689.34 and 5,443.35

Step by Step Solution

1. Step 1: Write the proportion equation
   9,919.55 : 13,689.34 = 5,443.35 : x
2. Step 2: Convert to fraction form
   9,919.55/13,689.34 = 5,443.35/x
3. Step 3: Cross multiply
   9,919.55x = 13,689.34 × 5,443.35
4. Step 4: Simplify right side
   9,919.55x = 74,515,803.95
5. Step 5: Solve for x
   x = 74,515,803.95/9,919.55
6. Step 6: Final answer
   x = 7,512.01