Finding the Fourth Proportional to 1,006.56, 1,501.20 and 957.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,006.56 : 1,501.20 = 957.96 : x
2. Step 2: Convert to fraction form
   1,006.56/1,501.20 = 957.96/x
3. Step 3: Cross multiply
   1,006.56x = 1,501.20 × 957.96
4. Step 4: Simplify right side
   1,006.56x = 1,438,089.55
5. Step 5: Solve for x
   x = 1,438,089.55/1,006.56
6. Step 6: Final answer
   x = 1,428.72