Finding the Fourth Proportional to 9,641.61, 13,299.89 and 5,661.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,641.61 : 13,299.89 = 5,661.99 : x
2. Step 2: Convert to fraction form
   9,641.61/13,299.89 = 5,661.99/x
3. Step 3: Cross multiply
   9,641.61x = 13,299.89 × 5,661.99
4. Step 4: Simplify right side
   9,641.61x = 75,303,815.87
5. Step 5: Solve for x
   x = 75,303,815.87/9,641.61
6. Step 6: Final answer
   x = 7,810.29