Finding the Fourth Proportional to 1,156.93, 1,736.15 and 426.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,156.93 : 1,736.15 = 426.51 : x
2. Step 2: Convert to fraction form
   1,156.93/1,736.15 = 426.51/x
3. Step 3: Cross multiply
   1,156.93x = 1,736.15 × 426.51
4. Step 4: Simplify right side
   1,156.93x = 740,485.34
5. Step 5: Solve for x
   x = 740,485.34/1,156.93
6. Step 6: Final answer
   x = 640.04