Finding the Fourth Proportional to 8,621.33, 11,894.31 and 5,638.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,621.33 : 11,894.31 = 5,638.86 : x
2. Step 2: Convert to fraction form
   8,621.33/11,894.31 = 5,638.86/x
3. Step 3: Cross multiply
   8,621.33x = 11,894.31 × 5,638.86
4. Step 4: Simplify right side
   8,621.33x = 67,070,348.89
5. Step 5: Solve for x
   x = 67,070,348.89/8,621.33
6. Step 6: Final answer
   x = 7,779.59