Finding the Fourth Proportional to 3,439.02, 5,158.94 and 1,978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,439.02 : 5,158.94 = 1,978.18 : x
2. Step 2: Convert to fraction form
   3,439.02/5,158.94 = 1,978.18/x
3. Step 3: Cross multiply
   3,439.02x = 5,158.94 × 1,978.18
4. Step 4: Simplify right side
   3,439.02x = 10,205,311.93
5. Step 5: Solve for x
   x = 10,205,311.93/3,439.02
6. Step 6: Final answer
   x = 2,967.51