Finding the Fourth Proportional to 1,401.95, 2,103.17 and 579.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.95 : 2,103.17 = 579.77 : x
2. Step 2: Convert to fraction form
   1,401.95/2,103.17 = 579.77/x
3. Step 3: Cross multiply
   1,401.95x = 2,103.17 × 579.77
4. Step 4: Simplify right side
   1,401.95x = 1,219,341.46
5. Step 5: Solve for x
   x = 1,219,341.46/1,401.95
6. Step 6: Final answer
   x = 869.75