Finding the Fourth Proportional to 1,089.34, 1,503.76 and 696.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.34 : 1,503.76 = 696.28 : x
2. Step 2: Convert to fraction form
   1,089.34/1,503.76 = 696.28/x
3. Step 3: Cross multiply
   1,089.34x = 1,503.76 × 696.28
4. Step 4: Simplify right side
   1,089.34x = 1,047,038.01
5. Step 5: Solve for x
   x = 1,047,038.01/1,089.34
6. Step 6: Final answer
   x = 961.17