Finding the Fourth Proportional to 1,428.99, 1,969.65 and 956.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.99 : 1,969.65 = 956.72 : x
2. Step 2: Convert to fraction form
   1,428.99/1,969.65 = 956.72/x
3. Step 3: Cross multiply
   1,428.99x = 1,969.65 × 956.72
4. Step 4: Simplify right side
   1,428.99x = 1,884,403.55
5. Step 5: Solve for x
   x = 1,884,403.55/1,428.99
6. Step 6: Final answer
   x = 1,318.70