Finding the Fourth Proportional to 15,477.90, 21,359.75 and 8,404.31

Step by Step Solution

1. Step 1: Write the proportion equation
   15,477.90 : 21,359.75 = 8,404.31 : x
2. Step 2: Convert to fraction form
   15,477.90/21,359.75 = 8,404.31/x
3. Step 3: Cross multiply
   15,477.90x = 21,359.75 × 8,404.31
4. Step 4: Simplify right side
   15,477.90x = 179,513,971.90
5. Step 5: Solve for x
   x = 179,513,971.90/15,477.90
6. Step 6: Final answer
   x = 11,598.09