Finding the Fourth Proportional to 3,890.99, 5,840.27 and 3,680.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,890.99 : 5,840.27 = 3,680.28 : x
2. Step 2: Convert to fraction form
   3,890.99/5,840.27 = 3,680.28/x
3. Step 3: Cross multiply
   3,890.99x = 5,840.27 × 3,680.28
4. Step 4: Simplify right side
   3,890.99x = 21,493,810.47
5. Step 5: Solve for x
   x = 21,493,810.47/3,890.99
6. Step 6: Final answer
   x = 5,524.00