Finding the Fourth Proportional to 8,992.89, 12,411.79 and 5,638.58

Step by Step Solution

1. Step 1: Write the proportion equation
   8,992.89 : 12,411.79 = 5,638.58 : x
2. Step 2: Convert to fraction form
   8,992.89/12,411.79 = 5,638.58/x
3. Step 3: Cross multiply
   8,992.89x = 12,411.79 × 5,638.58
4. Step 4: Simplify right side
   8,992.89x = 69,984,841.25
5. Step 5: Solve for x
   x = 69,984,841.25/8,992.89
6. Step 6: Final answer
   x = 7,782.24