Finding the Fourth Proportional to 9,913.22, 13,676.69 and 5,661.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,913.22 : 13,676.69 = 5,661.21 : x
2. Step 2: Convert to fraction form
   9,913.22/13,676.69 = 5,661.21/x
3. Step 3: Cross multiply
   9,913.22x = 13,676.69 × 5,661.21
4. Step 4: Simplify right side
   9,913.22x = 77,426,585.89
5. Step 5: Solve for x
   x = 77,426,585.89/9,913.22
6. Step 6: Final answer
   x = 7,810.44