Finding the Fourth Proportional to 9,904.30, 13,667.88 and 5,428.24

Step by Step Solution

1. Step 1: Write the proportion equation
   9,904.30 : 13,667.88 = 5,428.24 : x
2. Step 2: Convert to fraction form
   9,904.30/13,667.88 = 5,428.24/x
3. Step 3: Cross multiply
   9,904.30x = 13,667.88 × 5,428.24
4. Step 4: Simplify right side
   9,904.30x = 74,192,519.39
5. Step 5: Solve for x
   x = 74,192,519.39/9,904.30
6. Step 6: Final answer
   x = 7,490.94