Finding the Fourth Proportional to 1,577.25, 2,176.61 and 878.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,577.25 : 2,176.61 = 878.67 : x
2. Step 2: Convert to fraction form
   1,577.25/2,176.61 = 878.67/x
3. Step 3: Cross multiply
   1,577.25x = 2,176.61 × 878.67
4. Step 4: Simplify right side
   1,577.25x = 1,912,517.52
5. Step 5: Solve for x
   x = 1,912,517.52/1,577.25
6. Step 6: Final answer
   x = 1,212.56