Finding the Fourth Proportional to 5,621.88, 8,431.28 and 2,111.61

Step by Step Solution

1. Step 1: Write the proportion equation
   5,621.88 : 8,431.28 = 2,111.61 : x
2. Step 2: Convert to fraction form
   5,621.88/8,431.28 = 2,111.61/x
3. Step 3: Cross multiply
   5,621.88x = 8,431.28 × 2,111.61
4. Step 4: Simplify right side
   5,621.88x = 17,803,601.50
5. Step 5: Solve for x
   x = 17,803,601.50/5,621.88
6. Step 6: Final answer
   x = 3,166.84