Finding the Fourth Proportional to 1,238.91, 1,709.73 and 976.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.91 : 1,709.73 = 976.47 : x
2. Step 2: Convert to fraction form
   1,238.91/1,709.73 = 976.47/x
3. Step 3: Cross multiply
   1,238.91x = 1,709.73 × 976.47
4. Step 4: Simplify right side
   1,238.91x = 1,669,500.05
5. Step 5: Solve for x
   x = 1,669,500.05/1,238.91
6. Step 6: Final answer
   x = 1,347.56