Finding the Fourth Proportional to 9,903.97, 13,667.77 and 5,428.01

Step by Step Solution

1. Step 1: Write the proportion equation
   9,903.97 : 13,667.77 = 5,428.01 : x
2. Step 2: Convert to fraction form
   9,903.97/13,667.77 = 5,428.01/x
3. Step 3: Cross multiply
   9,903.97x = 13,667.77 × 5,428.01
4. Step 4: Simplify right side
   9,903.97x = 74,188,780.72
5. Step 5: Solve for x
   x = 74,188,780.72/9,903.97
6. Step 6: Final answer
   x = 7,490.81