Finding the Fourth Proportional to 1,402.40, 1,935.27 and 878.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.40 : 1,935.27 = 878.72 : x
2. Step 2: Convert to fraction form
   1,402.40/1,935.27 = 878.72/x
3. Step 3: Cross multiply
   1,402.40x = 1,935.27 × 878.72
4. Step 4: Simplify right side
   1,402.40x = 1,700,560.45
5. Step 5: Solve for x
   x = 1,700,560.45/1,402.40
6. Step 6: Final answer
   x = 1,212.61