Finding the Fourth Proportional to 9,904.29, 13,667.91 and 5,428.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,904.29 : 13,667.91 = 5,428.08 : x
2. Step 2: Convert to fraction form
   9,904.29/13,667.91 = 5,428.08/x
3. Step 3: Cross multiply
   9,904.29x = 13,667.91 × 5,428.08
4. Step 4: Simplify right side
   9,904.29x = 74,190,508.91
5. Step 5: Solve for x
   x = 74,190,508.91/9,904.29
6. Step 6: Final answer
   x = 7,490.74