Finding the Fourth Proportional to 9,864.17, 13,612.85 and 5,388.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,864.17 : 13,612.85 = 5,388.16 : x
2. Step 2: Convert to fraction form
   9,864.17/13,612.85 = 5,388.16/x
3. Step 3: Cross multiply
   9,864.17x = 13,612.85 × 5,388.16
4. Step 4: Simplify right side
   9,864.17x = 73,348,213.86
5. Step 5: Solve for x
   x = 73,348,213.86/9,864.17
6. Step 6: Final answer
   x = 7,435.82