Finding the Fourth Proportional to 1,297.23, 1,787.72 and 947.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,297.23 : 1,787.72 = 947.31 : x
2. Step 2: Convert to fraction form
   1,297.23/1,787.72 = 947.31/x
3. Step 3: Cross multiply
   1,297.23x = 1,787.72 × 947.31
4. Step 4: Simplify right side
   1,297.23x = 1,693,520.30
5. Step 5: Solve for x
   x = 1,693,520.30/1,297.23
6. Step 6: Final answer
   x = 1,305.49