Finding the Fourth Proportional to 1,071.72, 1,478.25 and 756.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.72 : 1,478.25 = 756.36 : x
2. Step 2: Convert to fraction form
   1,071.72/1,478.25 = 756.36/x
3. Step 3: Cross multiply
   1,071.72x = 1,478.25 × 756.36
4. Step 4: Simplify right side
   1,071.72x = 1,118,089.17
5. Step 5: Solve for x
   x = 1,118,089.17/1,071.72
6. Step 6: Final answer
   x = 1,043.27