Finding the Fourth Proportional to 4,939.62, 7,410.94 and 1,978.05

Step by Step Solution

1. Step 1: Write the proportion equation
   4,939.62 : 7,410.94 = 1,978.05 : x
2. Step 2: Convert to fraction form
   4,939.62/7,410.94 = 1,978.05/x
3. Step 3: Cross multiply
   4,939.62x = 7,410.94 × 1,978.05
4. Step 4: Simplify right side
   4,939.62x = 14,659,223.45
5. Step 5: Solve for x
   x = 14,659,223.45/4,939.62
6. Step 6: Final answer
   x = 2,967.69