Finding the Fourth Proportional to 4,651.02, 6,978.15 and 3,912.30

Step by Step Solution

1. Step 1: Write the proportion equation
   4,651.02 : 6,978.15 = 3,912.30 : x
2. Step 2: Convert to fraction form
   4,651.02/6,978.15 = 3,912.30/x
3. Step 3: Cross multiply
   4,651.02x = 6,978.15 × 3,912.30
4. Step 4: Simplify right side
   4,651.02x = 27,300,616.25
5. Step 5: Solve for x
   x = 27,300,616.25/4,651.02
6. Step 6: Final answer
   x = 5,869.81