Finding the Fourth Proportional to 15,667.49, 21,608.91 and 9,702.47

Step by Step Solution

1. Step 1: Write the proportion equation
   15,667.49 : 21,608.91 = 9,702.47 : x
2. Step 2: Convert to fraction form
   15,667.49/21,608.91 = 9,702.47/x
3. Step 3: Cross multiply
   15,667.49x = 21,608.91 × 9,702.47
4. Step 4: Simplify right side
   15,667.49x = 209,659,692.96
5. Step 5: Solve for x
   x = 209,659,692.96/15,667.49
6. Step 6: Final answer
   x = 13,381.83