Finding the Fourth Proportional to 1,157.72, 1,736.82 and 427.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,157.72 : 1,736.82 = 427.31 : x
2. Step 2: Convert to fraction form
   1,157.72/1,736.82 = 427.31/x
3. Step 3: Cross multiply
   1,157.72x = 1,736.82 × 427.31
4. Step 4: Simplify right side
   1,157.72x = 742,160.55
5. Step 5: Solve for x
   x = 742,160.55/1,157.72
6. Step 6: Final answer
   x = 641.05