Finding the Fourth Proportional to 1,156.98, 1,736.15 and 427.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,156.98 : 1,736.15 = 427.06 : x
2. Step 2: Convert to fraction form
   1,156.98/1,736.15 = 427.06/x
3. Step 3: Cross multiply
   1,156.98x = 1,736.15 × 427.06
4. Step 4: Simplify right side
   1,156.98x = 741,440.22
5. Step 5: Solve for x
   x = 741,440.22/1,156.98
6. Step 6: Final answer
   x = 640.84