Finding the Fourth Proportional to 1,144.58, 1,715.67 and 870.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.58 : 1,715.67 = 870.09 : x
2. Step 2: Convert to fraction form
   1,144.58/1,715.67 = 870.09/x
3. Step 3: Cross multiply
   1,144.58x = 1,715.67 × 870.09
4. Step 4: Simplify right side
   1,144.58x = 1,492,787.31
5. Step 5: Solve for x
   x = 1,492,787.31/1,144.58
6. Step 6: Final answer
   x = 1,304.23