Finding the Fourth Proportional to 8,889.82, 13,315.29 and 5,419.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,889.82 : 13,315.29 = 5,419.78 : x
2. Step 2: Convert to fraction form
   8,889.82/13,315.29 = 5,419.78/x
3. Step 3: Cross multiply
   8,889.82x = 13,315.29 × 5,419.78
4. Step 4: Simplify right side
   8,889.82x = 72,165,888.82
5. Step 5: Solve for x
   x = 72,165,888.82/8,889.82
6. Step 6: Final answer
   x = 8,117.81