Finding the Fourth Proportional to 1,499.40, 2,069.18 and 869.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,499.40 : 2,069.18 = 869.95 : x
2. Step 2: Convert to fraction form
   1,499.40/2,069.18 = 869.95/x
3. Step 3: Cross multiply
   1,499.40x = 2,069.18 × 869.95
4. Step 4: Simplify right side
   1,499.40x = 1,800,083.14
5. Step 5: Solve for x
   x = 1,800,083.14/1,499.40
6. Step 6: Final answer
   x = 1,200.54