Finding the Fourth Proportional to 1,913.67, 2,871.72 and 818.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,913.67 : 2,871.72 = 818.05 : x
2. Step 2: Convert to fraction form
   1,913.67/2,871.72 = 818.05/x
3. Step 3: Cross multiply
   1,913.67x = 2,871.72 × 818.05
4. Step 4: Simplify right side
   1,913.67x = 2,349,210.55
5. Step 5: Solve for x
   x = 2,349,210.55/1,913.67
6. Step 6: Final answer
   x = 1,227.59