Finding the Fourth Proportional to 1,401.75, 1,934.57 and 870.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.75 : 1,934.57 = 870.49 : x
2. Step 2: Convert to fraction form
   1,401.75/1,934.57 = 870.49/x
3. Step 3: Cross multiply
   1,401.75x = 1,934.57 × 870.49
4. Step 4: Simplify right side
   1,401.75x = 1,684,021.18
5. Step 5: Solve for x
   x = 1,684,021.18/1,401.75
6. Step 6: Final answer
   x = 1,201.37