Finding the Fourth Proportional to 9,605.80, 13,255.74 and 5,356.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,605.80 : 13,255.74 = 5,356.99 : x
2. Step 2: Convert to fraction form
   9,605.80/13,255.74 = 5,356.99/x
3. Step 3: Cross multiply
   9,605.80x = 13,255.74 × 5,356.99
4. Step 4: Simplify right side
   9,605.80x = 71,010,866.62
5. Step 5: Solve for x
   x = 71,010,866.62/9,605.80
6. Step 6: Final answer
   x = 7,392.50