Finding the Fourth Proportional to 1,401.78, 2,103.12 and 477.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.78 : 2,103.12 = 477.90 : x
2. Step 2: Convert to fraction form
   1,401.78/2,103.12 = 477.90/x
3. Step 3: Cross multiply
   1,401.78x = 2,103.12 × 477.90
4. Step 4: Simplify right side
   1,401.78x = 1,005,081.05
5. Step 5: Solve for x
   x = 1,005,081.05/1,401.78
6. Step 6: Final answer
   x = 717.00