Finding the Fourth Proportional to 1,428.53, 1,970.27 and 956.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.53 : 1,970.27 = 956.25 : x
2. Step 2: Convert to fraction form
   1,428.53/1,970.27 = 956.25/x
3. Step 3: Cross multiply
   1,428.53x = 1,970.27 × 956.25
4. Step 4: Simplify right side
   1,428.53x = 1,884,065.91
5. Step 5: Solve for x
   x = 1,884,065.91/1,428.53
6. Step 6: Final answer
   x = 1,318.89