Finding the Fourth Proportional to 15,436.72, 21,310.62 and 9,777.39

Step by Step Solution

1. Step 1: Write the proportion equation
   15,436.72 : 21,310.62 = 9,777.39 : x
2. Step 2: Convert to fraction form
   15,436.72/21,310.62 = 9,777.39/x
3. Step 3: Cross multiply
   15,436.72x = 21,310.62 × 9,777.39
4. Step 4: Simplify right side
   15,436.72x = 208,362,242.88
5. Step 5: Solve for x
   x = 208,362,242.88/15,436.72
6. Step 6: Final answer
   x = 13,497.83