Finding the Fourth Proportional to 6,389.73, 8,817.83 and 3,557.05

Step by Step Solution

1. Step 1: Write the proportion equation
   6,389.73 : 8,817.83 = 3,557.05 : x
2. Step 2: Convert to fraction form
   6,389.73/8,817.83 = 3,557.05/x
3. Step 3: Cross multiply
   6,389.73x = 8,817.83 × 3,557.05
4. Step 4: Simplify right side
   6,389.73x = 31,365,462.20
5. Step 5: Solve for x
   x = 31,365,462.20/6,389.73
6. Step 6: Final answer
   x = 4,908.73