Finding the Fourth Proportional to 3,590.78, 5,389.68 and 2,978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,590.78 : 5,389.68 = 2,978.42 : x
2. Step 2: Convert to fraction form
   3,590.78/5,389.68 = 2,978.42/x
3. Step 3: Cross multiply
   3,590.78x = 5,389.68 × 2,978.42
4. Step 4: Simplify right side
   3,590.78x = 16,052,730.71
5. Step 5: Solve for x
   x = 16,052,730.71/3,590.78
6. Step 6: Final answer
   x = 4,470.54