Finding the Fourth Proportional to 1,016.64, 1,401.42 and 622.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.64 : 1,401.42 = 622.98 : x
2. Step 2: Convert to fraction form
   1,016.64/1,401.42 = 622.98/x
3. Step 3: Cross multiply
   1,016.64x = 1,401.42 × 622.98
4. Step 4: Simplify right side
   1,016.64x = 873,056.63
5. Step 5: Solve for x
   x = 873,056.63/1,016.64
6. Step 6: Final answer
   x = 858.77