Finding the Fourth Proportional to 6,430.72, 8,875.82 and 3,912.29

Step by Step Solution

1. Step 1: Write the proportion equation
   6,430.72 : 8,875.82 = 3,912.29 : x
2. Step 2: Convert to fraction form
   6,430.72/8,875.82 = 3,912.29/x
3. Step 3: Cross multiply
   6,430.72x = 8,875.82 × 3,912.29
4. Step 4: Simplify right side
   6,430.72x = 34,724,781.83
5. Step 5: Solve for x
   x = 34,724,781.83/6,430.72
6. Step 6: Final answer
   x = 5,399.83