Finding the Fourth Proportional to 2,477.38, 3,714.70 and 810.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,477.38 : 3,714.70 = 810.72 : x
2. Step 2: Convert to fraction form
   2,477.38/3,714.70 = 810.72/x
3. Step 3: Cross multiply
   2,477.38x = 3,714.70 × 810.72
4. Step 4: Simplify right side
   2,477.38x = 3,011,581.58
5. Step 5: Solve for x
   x = 3,011,581.58/2,477.38
6. Step 6: Final answer
   x = 1,215.63