Finding the Fourth Proportional to 1,567.72, 2,351.69 and 1,278.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,567.72 : 2,351.69 = 1,278.55 : x
2. Step 2: Convert to fraction form
   1,567.72/2,351.69 = 1,278.55/x
3. Step 3: Cross multiply
   1,567.72x = 2,351.69 × 1,278.55
4. Step 4: Simplify right side
   1,567.72x = 3,006,753.25
5. Step 5: Solve for x
   x = 3,006,753.25/1,567.72
6. Step 6: Final answer
   x = 1,917.91