Finding the Fourth Proportional to 9,904.37, 13,667.99 and 5,428.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,904.37 : 13,667.99 = 5,428.31 : x
2. Step 2: Convert to fraction form
   9,904.37/13,667.99 = 5,428.31/x
3. Step 3: Cross multiply
   9,904.37x = 13,667.99 × 5,428.31
4. Step 4: Simplify right side
   9,904.37x = 74,193,991.32
5. Step 5: Solve for x
   x = 74,193,991.32/9,904.37
6. Step 6: Final answer
   x = 7,491.04