Finding the Fourth Proportional to 1,128.56, 1,683.52 and 956.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.56 : 1,683.52 = 956.30 : x
2. Step 2: Convert to fraction form
   1,128.56/1,683.52 = 956.30/x
3. Step 3: Cross multiply
   1,128.56x = 1,683.52 × 956.30
4. Step 4: Simplify right side
   1,128.56x = 1,609,950.18
5. Step 5: Solve for x
   x = 1,609,950.18/1,128.56
6. Step 6: Final answer
   x = 1,426.55