Finding the Fourth Proportional to 1,015.82, 1,401.93 and 623.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.82 : 1,401.93 = 623.10 : x
2. Step 2: Convert to fraction form
   1,015.82/1,401.93 = 623.10/x
3. Step 3: Cross multiply
   1,015.82x = 1,401.93 × 623.10
4. Step 4: Simplify right side
   1,015.82x = 873,542.58
5. Step 5: Solve for x
   x = 873,542.58/1,015.82
6. Step 6: Final answer
   x = 859.94