Finding the Fourth Proportional to 28,361.89, 42,548.91 and 8,642.03

Step by Step Solution

1. Step 1: Write the proportion equation
   28,361.89 : 42,548.91 = 8,642.03 : x
2. Step 2: Convert to fraction form
   28,361.89/42,548.91 = 8,642.03/x
3. Step 3: Cross multiply
   28,361.89x = 42,548.91 × 8,642.03
4. Step 4: Simplify right side
   28,361.89x = 367,708,956.69
5. Step 5: Solve for x
   x = 367,708,956.69/28,361.89
6. Step 6: Final answer
   x = 12,964.90