Finding the Fourth Proportional to 4,818.61, 7,222.41 and 2,188.12

Step by Step Solution

1. Step 1: Write the proportion equation
   4,818.61 : 7,222.41 = 2,188.12 : x
2. Step 2: Convert to fraction form
   4,818.61/7,222.41 = 2,188.12/x
3. Step 3: Cross multiply
   4,818.61x = 7,222.41 × 2,188.12
4. Step 4: Simplify right side
   4,818.61x = 15,803,499.77
5. Step 5: Solve for x
   x = 15,803,499.77/4,818.61
6. Step 6: Final answer
   x = 3,279.68