Finding the Fourth Proportional to 4,219.83, 6,305.72 and 3,158.78

Step by Step Solution

1. Step 1: Write the proportion equation
   4,219.83 : 6,305.72 = 3,158.78 : x
2. Step 2: Convert to fraction form
   4,219.83/6,305.72 = 3,158.78/x
3. Step 3: Cross multiply
   4,219.83x = 6,305.72 × 3,158.78
4. Step 4: Simplify right side
   4,219.83x = 19,918,334.90
5. Step 5: Solve for x
   x = 19,918,334.90/4,219.83
6. Step 6: Final answer
   x = 4,720.17