Finding the Fourth Proportional to 9,864.78, 13,612.84 and 5,388.46

Step by Step Solution

1. Step 1: Write the proportion equation
   9,864.78 : 13,612.84 = 5,388.46 : x
2. Step 2: Convert to fraction form
   9,864.78/13,612.84 = 5,388.46/x
3. Step 3: Cross multiply
   9,864.78x = 13,612.84 × 5,388.46
4. Step 4: Simplify right side
   9,864.78x = 73,352,243.83
5. Step 5: Solve for x
   x = 73,352,243.83/9,864.78
6. Step 6: Final answer
   x = 7,435.77