Finding the Fourth Proportional to 1,157.63, 1,735.89 and 426.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,157.63 : 1,735.89 = 426.69 : x
2. Step 2: Convert to fraction form
   1,157.63/1,735.89 = 426.69/x
3. Step 3: Cross multiply
   1,157.63x = 1,735.89 × 426.69
4. Step 4: Simplify right side
   1,157.63x = 740,693.19
5. Step 5: Solve for x
   x = 740,693.19/1,157.63
6. Step 6: Final answer
   x = 639.84