Finding the Fourth Proportional to 1,014.96, 1,401.01 and 642.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.96 : 1,401.01 = 642.19 : x
2. Step 2: Convert to fraction form
   1,014.96/1,401.01 = 642.19/x
3. Step 3: Cross multiply
   1,014.96x = 1,401.01 × 642.19
4. Step 4: Simplify right side
   1,014.96x = 899,714.61
5. Step 5: Solve for x
   x = 899,714.61/1,014.96
6. Step 6: Final answer
   x = 886.45