Finding the Fourth Proportional to 8,713.98, 12,019.39 and 5,355.11

Step by Step Solution

1. Step 1: Write the proportion equation
   8,713.98 : 12,019.39 = 5,355.11 : x
2. Step 2: Convert to fraction form
   8,713.98/12,019.39 = 5,355.11/x
3. Step 3: Cross multiply
   8,713.98x = 12,019.39 × 5,355.11
4. Step 4: Simplify right side
   8,713.98x = 64,365,172.24
5. Step 5: Solve for x
   x = 64,365,172.24/8,713.98
6. Step 6: Final answer
   x = 7,386.43