Finding the Fourth Proportional to 6,435.42, 9,638.01 and 3,138.18

Step by Step Solution

1. Step 1: Write the proportion equation
   6,435.42 : 9,638.01 = 3,138.18 : x
2. Step 2: Convert to fraction form
   6,435.42/9,638.01 = 3,138.18/x
3. Step 3: Cross multiply
   6,435.42x = 9,638.01 × 3,138.18
4. Step 4: Simplify right side
   6,435.42x = 30,245,810.22
5. Step 5: Solve for x
   x = 30,245,810.22/6,435.42
6. Step 6: Final answer
   x = 4,699.90