Finding the Fourth Proportional to 1,058.21, 1,460.61 and 638.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,058.21 : 1,460.61 = 638.59 : x
2. Step 2: Convert to fraction form
   1,058.21/1,460.61 = 638.59/x
3. Step 3: Cross multiply
   1,058.21x = 1,460.61 × 638.59
4. Step 4: Simplify right side
   1,058.21x = 932,727.29
5. Step 5: Solve for x
   x = 932,727.29/1,058.21
6. Step 6: Final answer
   x = 881.42