Finding the Fourth Proportional to 1,571.39, 2,355.27 and 878.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.39 : 2,355.27 = 878.37 : x
2. Step 2: Convert to fraction form
   1,571.39/2,355.27 = 878.37/x
3. Step 3: Cross multiply
   1,571.39x = 2,355.27 × 878.37
4. Step 4: Simplify right side
   1,571.39x = 2,068,798.51
5. Step 5: Solve for x
   x = 2,068,798.51/1,571.39
6. Step 6: Final answer
   x = 1,316.54