Finding the Fourth Proportional to 9,888.28, 13,645.71 and 5,411.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,888.28 : 13,645.71 = 5,411.99 : x
2. Step 2: Convert to fraction form
   9,888.28/13,645.71 = 5,411.99/x
3. Step 3: Cross multiply
   9,888.28x = 13,645.71 × 5,411.99
4. Step 4: Simplify right side
   9,888.28x = 73,850,446.06
5. Step 5: Solve for x
   x = 73,850,446.06/9,888.28
6. Step 6: Final answer
   x = 7,468.48