Finding the Fourth Proportional to 1,031.78, 1,549.56 and 926.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.78 : 1,549.56 = 926.12 : x
2. Step 2: Convert to fraction form
   1,031.78/1,549.56 = 926.12/x
3. Step 3: Cross multiply
   1,031.78x = 1,549.56 × 926.12
4. Step 4: Simplify right side
   1,031.78x = 1,435,078.51
5. Step 5: Solve for x
   x = 1,435,078.51/1,031.78
6. Step 6: Final answer
   x = 1,390.88