Finding the Fourth Proportional to 1,064.52, 1,469.88 and 870.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.52 : 1,469.88 = 870.12 : x
2. Step 2: Convert to fraction form
   1,064.52/1,469.88 = 870.12/x
3. Step 3: Cross multiply
   1,064.52x = 1,469.88 × 870.12
4. Step 4: Simplify right side
   1,064.52x = 1,278,971.99
5. Step 5: Solve for x
   x = 1,278,971.99/1,064.52
6. Step 6: Final answer
   x = 1,201.45