Finding the Fourth Proportional to 1,401.77, 1,934.41 and 878.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.77 : 1,934.41 = 878.09 : x
2. Step 2: Convert to fraction form
   1,401.77/1,934.41 = 878.09/x
3. Step 3: Cross multiply
   1,401.77x = 1,934.41 × 878.09
4. Step 4: Simplify right side
   1,401.77x = 1,698,572.01
5. Step 5: Solve for x
   x = 1,698,572.01/1,401.77
6. Step 6: Final answer
   x = 1,211.74