Finding the Fourth Proportional to 1,401.39, 2,100.24 and 578.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.39 : 2,100.24 = 578.52 : x
2. Step 2: Convert to fraction form
   1,401.39/2,100.24 = 578.52/x
3. Step 3: Cross multiply
   1,401.39x = 2,100.24 × 578.52
4. Step 4: Simplify right side
   1,401.39x = 1,215,030.84
5. Step 5: Solve for x
   x = 1,215,030.84/1,401.39
6. Step 6: Final answer
   x = 867.02