Finding the Fourth Proportional to 1,016.34, 1,401.57 and 906.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.34 : 1,401.57 = 906.90 : x
2. Step 2: Convert to fraction form
   1,016.34/1,401.57 = 906.90/x
3. Step 3: Cross multiply
   1,016.34x = 1,401.57 × 906.90
4. Step 4: Simplify right side
   1,016.34x = 1,271,083.83
5. Step 5: Solve for x
   x = 1,271,083.83/1,016.34
6. Step 6: Final answer
   x = 1,250.65