Finding the Fourth Proportional to 1,499.68, 2,069.72 and 870.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,499.68 : 2,069.72 = 870.02 : x
2. Step 2: Convert to fraction form
   1,499.68/2,069.72 = 870.02/x
3. Step 3: Cross multiply
   1,499.68x = 2,069.72 × 870.02
4. Step 4: Simplify right side
   1,499.68x = 1,800,693.44
5. Step 5: Solve for x
   x = 1,800,693.44/1,499.68
6. Step 6: Final answer
   x = 1,200.72