Finding the Fourth Proportional to 2,870.76, 4,306.12 and 818.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.76 : 4,306.12 = 818.76 : x
2. Step 2: Convert to fraction form
   2,870.76/4,306.12 = 818.76/x
3. Step 3: Cross multiply
   2,870.76x = 4,306.12 × 818.76
4. Step 4: Simplify right side
   2,870.76x = 3,525,678.81
5. Step 5: Solve for x
   x = 3,525,678.81/2,870.76
6. Step 6: Final answer
   x = 1,228.13