Finding the Fourth Proportional to 1,499.55, 2,069.25 and 870.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,499.55 : 2,069.25 = 870.12 : x
2. Step 2: Convert to fraction form
   1,499.55/2,069.25 = 870.12/x
3. Step 3: Cross multiply
   1,499.55x = 2,069.25 × 870.12
4. Step 4: Simplify right side
   1,499.55x = 1,800,495.81
5. Step 5: Solve for x
   x = 1,800,495.81/1,499.55
6. Step 6: Final answer
   x = 1,200.69