Finding the Fourth Proportional to 1,408.72, 2,109.48 and 976.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.72 : 2,109.48 = 976.72 : x
2. Step 2: Convert to fraction form
   1,408.72/2,109.48 = 976.72/x
3. Step 3: Cross multiply
   1,408.72x = 2,109.48 × 976.72
4. Step 4: Simplify right side
   1,408.72x = 2,060,371.31
5. Step 5: Solve for x
   x = 2,060,371.31/1,408.72
6. Step 6: Final answer
   x = 1,462.58