Finding the Fourth Proportional to 1,069.79, 1,474.55 and 715.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069.79 : 1,474.55 = 715.59 : x
2. Step 2: Convert to fraction form
   1,069.79/1,474.55 = 715.59/x
3. Step 3: Cross multiply
   1,069.79x = 1,474.55 × 715.59
4. Step 4: Simplify right side
   1,069.79x = 1,055,173.23
5. Step 5: Solve for x
   x = 1,055,173.23/1,069.79
6. Step 6: Final answer
   x = 986.34