Finding the Fourth Proportional to 1,058.10, 1,460.27 and 638.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,058.10 : 1,460.27 = 638.58 : x
2. Step 2: Convert to fraction form
   1,058.10/1,460.27 = 638.58/x
3. Step 3: Cross multiply
   1,058.10x = 1,460.27 × 638.58
4. Step 4: Simplify right side
   1,058.10x = 932,499.22
5. Step 5: Solve for x
   x = 932,499.22/1,058.10
6. Step 6: Final answer
   x = 881.30