Finding the Fourth Proportional to 9,905.09, 13,667.28 and 5,654.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,905.09 : 13,667.28 = 5,654.21 : x
2. Step 2: Convert to fraction form
   9,905.09/13,667.28 = 5,654.21/x
3. Step 3: Cross multiply
   9,905.09x = 13,667.28 × 5,654.21
4. Step 4: Simplify right side
   9,905.09x = 77,277,671.25
5. Step 5: Solve for x
   x = 77,277,671.25/9,905.09
6. Step 6: Final answer
   x = 7,801.81