Finding the Fourth Proportional to 10,985.78, 16,478.73 and 3,590.06

Step by Step Solution

1. Step 1: Write the proportion equation
   10,985.78 : 16,478.73 = 3,590.06 : x
2. Step 2: Convert to fraction form
   10,985.78/16,478.73 = 3,590.06/x
3. Step 3: Cross multiply
   10,985.78x = 16,478.73 × 3,590.06
4. Step 4: Simplify right side
   10,985.78x = 59,159,629.42
5. Step 5: Solve for x
   x = 59,159,629.42/10,985.78
6. Step 6: Final answer
   x = 5,385.11