Finding the Fourth Proportional to 1,041.69, 1,436.94 and 621.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,041.69 : 1,436.94 = 621.91 : x
2. Step 2: Convert to fraction form
   1,041.69/1,436.94 = 621.91/x
3. Step 3: Cross multiply
   1,041.69x = 1,436.94 × 621.91
4. Step 4: Simplify right side
   1,041.69x = 893,649.15
5. Step 5: Solve for x
   x = 893,649.15/1,041.69
6. Step 6: Final answer
   x = 857.88