Finding the Fourth Proportional to 2,547.59, 3,818.96 and 815.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.59 : 3,818.96 = 815.03 : x
2. Step 2: Convert to fraction form
   2,547.59/3,818.96 = 815.03/x
3. Step 3: Cross multiply
   2,547.59x = 3,818.96 × 815.03
4. Step 4: Simplify right side
   2,547.59x = 3,112,562.89
5. Step 5: Solve for x
   x = 3,112,562.89/2,547.59
6. Step 6: Final answer
   x = 1,221.77