Finding the Fourth Proportional to 1,401.63, 2,100.92 and 579.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.63 : 2,100.92 = 579.47 : x
2. Step 2: Convert to fraction form
   1,401.63/2,100.92 = 579.47/x
3. Step 3: Cross multiply
   1,401.63x = 2,100.92 × 579.47
4. Step 4: Simplify right side
   1,401.63x = 1,217,406.71
5. Step 5: Solve for x
   x = 1,217,406.71/1,401.63
6. Step 6: Final answer
   x = 868.56