Finding the Fourth Proportional to 9,864.61, 13,612.86 and 5,388.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,864.61 : 13,612.86 = 5,388.34 : x
2. Step 2: Convert to fraction form
   9,864.61/13,612.86 = 5,388.34/x
3. Step 3: Cross multiply
   9,864.61x = 13,612.86 × 5,388.34
4. Step 4: Simplify right side
   9,864.61x = 73,350,718.05
5. Step 5: Solve for x
   x = 73,350,718.05/9,864.61
6. Step 6: Final answer
   x = 7,435.74