Finding the Fourth Proportional to 1,139.34, 1,706.10 and 956.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.34 : 1,706.10 = 956.28 : x
2. Step 2: Convert to fraction form
   1,139.34/1,706.10 = 956.28/x
3. Step 3: Cross multiply
   1,139.34x = 1,706.10 × 956.28
4. Step 4: Simplify right side
   1,139.34x = 1,631,509.31
5. Step 5: Solve for x
   x = 1,631,509.31/1,139.34
6. Step 6: Final answer
   x = 1,431.98