Finding the Fourth Proportional to 6,386.78, 8,813.61 and 3,554.04

Step by Step Solution

1. Step 1: Write the proportion equation
   6,386.78 : 8,813.61 = 3,554.04 : x
2. Step 2: Convert to fraction form
   6,386.78/8,813.61 = 3,554.04/x
3. Step 3: Cross multiply
   6,386.78x = 8,813.61 × 3,554.04
4. Step 4: Simplify right side
   6,386.78x = 31,323,922.48
5. Step 5: Solve for x
   x = 31,323,922.48/6,386.78
6. Step 6: Final answer
   x = 4,904.50