Finding the Fourth Proportional to 15,477.73, 21,359.35 and 8,404.15

Step by Step Solution

1. Step 1: Write the proportion equation
   15,477.73 : 21,359.35 = 8,404.15 : x
2. Step 2: Convert to fraction form
   15,477.73/21,359.35 = 8,404.15/x
3. Step 3: Cross multiply
   15,477.73x = 21,359.35 × 8,404.15
4. Step 4: Simplify right side
   15,477.73x = 179,507,178.46
5. Step 5: Solve for x
   x = 179,507,178.46/15,477.73
6. Step 6: Final answer
   x = 11,597.77