Finding the Fourth Proportional to 1,404.50, 2,106.90 and 479.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.50 : 2,106.90 = 479.79 : x
2. Step 2: Convert to fraction form
   1,404.50/2,106.90 = 479.79/x
3. Step 3: Cross multiply
   1,404.50x = 2,106.90 × 479.79
4. Step 4: Simplify right side
   1,404.50x = 1,010,869.55
5. Step 5: Solve for x
   x = 1,010,869.55/1,404.50
6. Step 6: Final answer
   x = 719.74