Finding the Fourth Proportional to 9,887.88, 13,645.25 and 5,411.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,887.88 : 13,645.25 = 5,411.60 : x
2. Step 2: Convert to fraction form
   9,887.88/13,645.25 = 5,411.60/x
3. Step 3: Cross multiply
   9,887.88x = 13,645.25 × 5,411.60
4. Step 4: Simplify right side
   9,887.88x = 73,842,539.62
5. Step 5: Solve for x
   x = 73,842,539.62/9,887.88
6. Step 6: Final answer
   x = 7,467.99