Finding the Fourth Proportional to 749.69, 1,123.76 and 287.34

Step by Step Solution

1. Step 1: Write the proportion equation
   749.69 : 1,123.76 = 287.34 : x
2. Step 2: Convert to fraction form
   749.69/1,123.76 = 287.34/x
3. Step 3: Cross multiply
   749.69x = 1,123.76 × 287.34
4. Step 4: Simplify right side
   749.69x = 322,899.76
5. Step 5: Solve for x
   x = 322,899.76/749.69
6. Step 6: Final answer
   x = 430.71