Finding the Fourth Proportional to 9,855.94, 13,603.54 and 5,666.62

Step by Step Solution

1. Step 1: Write the proportion equation
   9,855.94 : 13,603.54 = 5,666.62 : x
2. Step 2: Convert to fraction form
   9,855.94/13,603.54 = 5,666.62/x
3. Step 3: Cross multiply
   9,855.94x = 13,603.54 × 5,666.62
4. Step 4: Simplify right side
   9,855.94x = 77,086,091.83
5. Step 5: Solve for x
   x = 77,086,091.83/9,855.94
6. Step 6: Final answer
   x = 7,821.28