Finding the Fourth Proportional to 1,308.88, 1,807.42 and 976.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.88 : 1,807.42 = 976.73 : x
2. Step 2: Convert to fraction form
   1,308.88/1,807.42 = 976.73/x
3. Step 3: Cross multiply
   1,308.88x = 1,807.42 × 976.73
4. Step 4: Simplify right side
   1,308.88x = 1,765,361.34
5. Step 5: Solve for x
   x = 1,765,361.34/1,308.88
6. Step 6: Final answer
   x = 1,348.76