Finding the Fourth Proportional to 2,860.82, 4,291.86 and 912.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,860.82 : 4,291.86 = 912.98 : x
2. Step 2: Convert to fraction form
   2,860.82/4,291.86 = 912.98/x
3. Step 3: Cross multiply
   2,860.82x = 4,291.86 × 912.98
4. Step 4: Simplify right side
   2,860.82x = 3,918,382.34
5. Step 5: Solve for x
   x = 3,918,382.34/2,860.82
6. Step 6: Final answer
   x = 1,369.67