Finding the Fourth Proportional to 1,401.45, 1,933.53 and 870.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.45 : 1,933.53 = 870.15 : x
2. Step 2: Convert to fraction form
   1,401.45/1,933.53 = 870.15/x
3. Step 3: Cross multiply
   1,401.45x = 1,933.53 × 870.15
4. Step 4: Simplify right side
   1,401.45x = 1,682,454.24
5. Step 5: Solve for x
   x = 1,682,454.24/1,401.45
6. Step 6: Final answer
   x = 1,200.51