Finding the Fourth Proportional to 1,019.52, 1,405.08 and 870.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.52 : 1,405.08 = 870.48 : x
2. Step 2: Convert to fraction form
   1,019.52/1,405.08 = 870.48/x
3. Step 3: Cross multiply
   1,019.52x = 1,405.08 × 870.48
4. Step 4: Simplify right side
   1,019.52x = 1,223,094.04
5. Step 5: Solve for x
   x = 1,223,094.04/1,019.52
6. Step 6: Final answer
   x = 1,199.68