Finding the Fourth Proportional to 1,156.89, 1,735.34 and 426.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,156.89 : 1,735.34 = 426.07 : x
2. Step 2: Convert to fraction form
   1,156.89/1,735.34 = 426.07/x
3. Step 3: Cross multiply
   1,156.89x = 1,735.34 × 426.07
4. Step 4: Simplify right side
   1,156.89x = 739,376.31
5. Step 5: Solve for x
   x = 739,376.31/1,156.89
6. Step 6: Final answer
   x = 639.11