Finding the Fourth Proportional to 9,887.34, 13,644.54 and 5,411.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,887.34 : 13,644.54 = 5,411.28 : x
2. Step 2: Convert to fraction form
   9,887.34/13,644.54 = 5,411.28/x
3. Step 3: Cross multiply
   9,887.34x = 13,644.54 × 5,411.28
4. Step 4: Simplify right side
   9,887.34x = 73,834,426.41
5. Step 5: Solve for x
   x = 73,834,426.41/9,887.34
6. Step 6: Final answer
   x = 7,467.57