Finding the Fourth Proportional to 2,575.65, 3,864.69 and 1,278.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,575.65 : 3,864.69 = 1,278.03 : x
2. Step 2: Convert to fraction form
   2,575.65/3,864.69 = 1,278.03/x
3. Step 3: Cross multiply
   2,575.65x = 3,864.69 × 1,278.03
4. Step 4: Simplify right side
   2,575.65x = 4,939,189.76
5. Step 5: Solve for x
   x = 4,939,189.76/2,575.65
6. Step 6: Final answer
   x = 1,917.65