Finding the Fourth Proportional to 1,401.76, 1,935.73 and 878.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.76 : 1,935.73 = 878.70 : x
2. Step 2: Convert to fraction form
   1,401.76/1,935.73 = 878.70/x
3. Step 3: Cross multiply
   1,401.76x = 1,935.73 × 878.70
4. Step 4: Simplify right side
   1,401.76x = 1,700,923.42
5. Step 5: Solve for x
   x = 1,700,923.42/1,401.76
6. Step 6: Final answer
   x = 1,213.42