Finding the Fourth Proportional to 1,042.51, 1,563.72 and 426.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.51 : 1,563.72 = 426.06 : x
2. Step 2: Convert to fraction form
   1,042.51/1,563.72 = 426.06/x
3. Step 3: Cross multiply
   1,042.51x = 1,563.72 × 426.06
4. Step 4: Simplify right side
   1,042.51x = 666,238.54
5. Step 5: Solve for x
   x = 666,238.54/1,042.51
6. Step 6: Final answer
   x = 639.07