Finding the Fourth Proportional to 1,400.06, 2,100.61 and 578.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.06 : 2,100.61 = 578.41 : x
2. Step 2: Convert to fraction form
   1,400.06/2,100.61 = 578.41/x
3. Step 3: Cross multiply
   1,400.06x = 2,100.61 × 578.41
4. Step 4: Simplify right side
   1,400.06x = 1,215,003.33
5. Step 5: Solve for x
   x = 1,215,003.33/1,400.06
6. Step 6: Final answer
   x = 867.82