Finding the Fourth Proportional to 1,192.59, 1,789.49 and 870.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,192.59 : 1,789.49 = 870.62 : x
2. Step 2: Convert to fraction form
   1,192.59/1,789.49 = 870.62/x
3. Step 3: Cross multiply
   1,192.59x = 1,789.49 × 870.62
4. Step 4: Simplify right side
   1,192.59x = 1,557,959.01
5. Step 5: Solve for x
   x = 1,557,959.01/1,192.59
6. Step 6: Final answer
   x = 1,306.37