Finding the Fourth Proportional to 1,072.59, 1,479.71 and 718.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.59 : 1,479.71 = 718.16 : x
2. Step 2: Convert to fraction form
   1,072.59/1,479.71 = 718.16/x
3. Step 3: Cross multiply
   1,072.59x = 1,479.71 × 718.16
4. Step 4: Simplify right side
   1,072.59x = 1,062,657.54
5. Step 5: Solve for x
   x = 1,062,657.54/1,072.59
6. Step 6: Final answer
   x = 990.74