Finding the Fourth Proportional to 1,041.46, 1,436.72 and 621.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,041.46 : 1,436.72 = 621.57 : x
2. Step 2: Convert to fraction form
   1,041.46/1,436.72 = 621.57/x
3. Step 3: Cross multiply
   1,041.46x = 1,436.72 × 621.57
4. Step 4: Simplify right side
   1,041.46x = 893,023.60
5. Step 5: Solve for x
   x = 893,023.60/1,041.46
6. Step 6: Final answer
   x = 857.47