Finding the Fourth Proportional to 1,369.60, 1,890.48 and 976.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.60 : 1,890.48 = 976.72 : x
2. Step 2: Convert to fraction form
   1,369.60/1,890.48 = 976.72/x
3. Step 3: Cross multiply
   1,369.60x = 1,890.48 × 976.72
4. Step 4: Simplify right side
   1,369.60x = 1,846,469.63
5. Step 5: Solve for x
   x = 1,846,469.63/1,369.60
6. Step 6: Final answer
   x = 1,348.18