Finding the Fourth Proportional to 9,361.59, 12,921.85 and 5,777.64

Step by Step Solution

1. Step 1: Write the proportion equation
   9,361.59 : 12,921.85 = 5,777.64 : x
2. Step 2: Convert to fraction form
   9,361.59/12,921.85 = 5,777.64/x
3. Step 3: Cross multiply
   9,361.59x = 12,921.85 × 5,777.64
4. Step 4: Simplify right side
   9,361.59x = 74,657,797.43
5. Step 5: Solve for x
   x = 74,657,797.43/9,361.59
6. Step 6: Final answer
   x = 7,974.91