Finding the Fourth Proportional to 7,861.18, 10,846.56 and 4,990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,861.18 : 10,846.56 = 4,990.72 : x
2. Step 2: Convert to fraction form
   7,861.18/10,846.56 = 4,990.72/x
3. Step 3: Cross multiply
   7,861.18x = 10,846.56 × 4,990.72
4. Step 4: Simplify right side
   7,861.18x = 54,132,143.92
5. Step 5: Solve for x
   x = 54,132,143.92/7,861.18
6. Step 6: Final answer
   x = 6,886.01