Finding the Fourth Proportional to 1,390.35, 1,918.35 and 892.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.35 : 1,918.35 = 892.83 : x
2. Step 2: Convert to fraction form
   1,390.35/1,918.35 = 892.83/x
3. Step 3: Cross multiply
   1,390.35x = 1,918.35 × 892.83
4. Step 4: Simplify right side
   1,390.35x = 1,712,760.43
5. Step 5: Solve for x
   x = 1,712,760.43/1,390.35
6. Step 6: Final answer
   x = 1,231.89