Finding the Fourth Proportional to 1,409.34, 1,945.62 and 878.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,409.34 : 1,945.62 = 878.39 : x
2. Step 2: Convert to fraction form
   1,409.34/1,945.62 = 878.39/x
3. Step 3: Cross multiply
   1,409.34x = 1,945.62 × 878.39
4. Step 4: Simplify right side
   1,409.34x = 1,709,003.42
5. Step 5: Solve for x
   x = 1,709,003.42/1,409.34
6. Step 6: Final answer
   x = 1,212.63