Finding the Fourth Proportional to 1,404.16, 2,106.54 and 479.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.16 : 2,106.54 = 479.86 : x
2. Step 2: Convert to fraction form
   1,404.16/2,106.54 = 479.86/x
3. Step 3: Cross multiply
   1,404.16x = 2,106.54 × 479.86
4. Step 4: Simplify right side
   1,404.16x = 1,010,844.28
5. Step 5: Solve for x
   x = 1,010,844.28/1,404.16
6. Step 6: Final answer
   x = 719.89