Finding the Fourth Proportional to 15,477.84, 21,359.46 and 8,404.20

Step by Step Solution

1. Step 1: Write the proportion equation
   15,477.84 : 21,359.46 = 8,404.20 : x
2. Step 2: Convert to fraction form
   15,477.84/21,359.46 = 8,404.20/x
3. Step 3: Cross multiply
   15,477.84x = 21,359.46 × 8,404.20
4. Step 4: Simplify right side
   15,477.84x = 179,509,173.73
5. Step 5: Solve for x
   x = 179,509,173.73/15,477.84
6. Step 6: Final answer
   x = 11,597.82