Finding the Fourth Proportional to 9,887.61, 13,644.66 and 5,411.35

Step by Step Solution

1. Step 1: Write the proportion equation
   9,887.61 : 13,644.66 = 5,411.35 : x
2. Step 2: Convert to fraction form
   9,887.61/13,644.66 = 5,411.35/x
3. Step 3: Cross multiply
   9,887.61x = 13,644.66 × 5,411.35
4. Step 4: Simplify right side
   9,887.61x = 73,836,030.89
5. Step 5: Solve for x
   x = 73,836,030.89/9,887.61
6. Step 6: Final answer
   x = 7,467.53