Finding the Fourth Proportional to 1,159.73, 1,738.50 and 428.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,159.73 : 1,738.50 = 428.81 : x
2. Step 2: Convert to fraction form
   1,159.73/1,738.50 = 428.81/x
3. Step 3: Cross multiply
   1,159.73x = 1,738.50 × 428.81
4. Step 4: Simplify right side
   1,159.73x = 745,484.04
5. Step 5: Solve for x
   x = 745,484.04/1,159.73
6. Step 6: Final answer
   x = 642.81