Finding the Fourth Proportional to 1,156.61, 1,735.59 and 426.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,156.61 : 1,735.59 = 426.24 : x
2. Step 2: Convert to fraction form
   1,156.61/1,735.59 = 426.24/x
3. Step 3: Cross multiply
   1,156.61x = 1,735.59 × 426.24
4. Step 4: Simplify right side
   1,156.61x = 739,777.88
5. Step 5: Solve for x
   x = 739,777.88/1,156.61
6. Step 6: Final answer
   x = 639.61