Finding the Fourth Proportional to 1,404.38, 2,106.56 and 479.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.38 : 2,106.56 = 479.91 : x
2. Step 2: Convert to fraction form
   1,404.38/2,106.56 = 479.91/x
3. Step 3: Cross multiply
   1,404.38x = 2,106.56 × 479.91
4. Step 4: Simplify right side
   1,404.38x = 1,010,956.81
5. Step 5: Solve for x
   x = 1,010,956.81/1,404.38
6. Step 6: Final answer
   x = 719.86