Finding the Fourth Proportional to 1,056.89, 1,585.61 and 479.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.89 : 1,585.61 = 479.63 : x
2. Step 2: Convert to fraction form
   1,056.89/1,585.61 = 479.63/x
3. Step 3: Cross multiply
   1,056.89x = 1,585.61 × 479.63
4. Step 4: Simplify right side
   1,056.89x = 760,495.80
5. Step 5: Solve for x
   x = 760,495.80/1,056.89
6. Step 6: Final answer
   x = 719.56