Finding the Fourth Proportional to 1,375.47, 1,898.78 and 878.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.47 : 1,898.78 = 878.67 : x
2. Step 2: Convert to fraction form
   1,375.47/1,898.78 = 878.67/x
3. Step 3: Cross multiply
   1,375.47x = 1,898.78 × 878.67
4. Step 4: Simplify right side
   1,375.47x = 1,668,396.63
5. Step 5: Solve for x
   x = 1,668,396.63/1,375.47
6. Step 6: Final answer
   x = 1,212.96