Finding the Fourth Proportional to 1,064.80, 1,469.87 and 715.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.80 : 1,469.87 = 715.69 : x
2. Step 2: Convert to fraction form
   1,064.80/1,469.87 = 715.69/x
3. Step 3: Cross multiply
   1,064.80x = 1,469.87 × 715.69
4. Step 4: Simplify right side
   1,064.80x = 1,051,965.95
5. Step 5: Solve for x
   x = 1,051,965.95/1,064.80
6. Step 6: Final answer
   x = 987.95