Finding the Fourth Proportional to 6,386.72, 8,813.67 and 3,554.35

Step by Step Solution

1. Step 1: Write the proportion equation
   6,386.72 : 8,813.67 = 3,554.35 : x
2. Step 2: Convert to fraction form
   6,386.72/8,813.67 = 3,554.35/x
3. Step 3: Cross multiply
   6,386.72x = 8,813.67 × 3,554.35
4. Step 4: Simplify right side
   6,386.72x = 31,326,823.90
5. Step 5: Solve for x
   x = 31,326,823.90/6,386.72
6. Step 6: Final answer
   x = 4,905.00