Finding the Fourth Proportional to 1,015.34, 1,401.46 and 622.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.34 : 1,401.46 = 622.76 : x
2. Step 2: Convert to fraction form
   1,015.34/1,401.46 = 622.76/x
3. Step 3: Cross multiply
   1,015.34x = 1,401.46 × 622.76
4. Step 4: Simplify right side
   1,015.34x = 872,773.23
5. Step 5: Solve for x
   x = 872,773.23/1,015.34
6. Step 6: Final answer
   x = 859.59