Finding the Fourth Proportional to 2,051.07, 3,077.90 and 818.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,051.07 : 3,077.90 = 818.61 : x
2. Step 2: Convert to fraction form
   2,051.07/3,077.90 = 818.61/x
3. Step 3: Cross multiply
   2,051.07x = 3,077.90 × 818.61
4. Step 4: Simplify right side
   2,051.07x = 2,519,587.15
5. Step 5: Solve for x
   x = 2,519,587.15/2,051.07
6. Step 6: Final answer
   x = 1,228.43