Finding the Fourth Proportional to 1,499.31, 2,069.12 and 870.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,499.31 : 2,069.12 = 870.04 : x
2. Step 2: Convert to fraction form
   1,499.31/2,069.12 = 870.04/x
3. Step 3: Cross multiply
   1,499.31x = 2,069.12 × 870.04
4. Step 4: Simplify right side
   1,499.31x = 1,800,217.16
5. Step 5: Solve for x
   x = 1,800,217.16/1,499.31
6. Step 6: Final answer
   x = 1,200.70