Finding the Fourth Proportional to 9,555.31, 13,187.82 and 5,578.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,555.31 : 13,187.82 = 5,578.75 : x
2. Step 2: Convert to fraction form
   9,555.31/13,187.82 = 5,578.75/x
3. Step 3: Cross multiply
   9,555.31x = 13,187.82 × 5,578.75
4. Step 4: Simplify right side
   9,555.31x = 73,571,550.83
5. Step 5: Solve for x
   x = 73,571,550.83/9,555.31
6. Step 6: Final answer
   x = 7,699.55