Finding the Fourth Proportional to 1,886.83, 2,830.28 and 912.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,886.83 : 2,830.28 = 912.69 : x
2. Step 2: Convert to fraction form
   1,886.83/2,830.28 = 912.69/x
3. Step 3: Cross multiply
   1,886.83x = 2,830.28 × 912.69
4. Step 4: Simplify right side
   1,886.83x = 2,583,163.69
5. Step 5: Solve for x
   x = 2,583,163.69/1,886.83
6. Step 6: Final answer
   x = 1,369.05