Finding the Fourth Proportional to 2,997.72, 4,496.81 and 917.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,997.72 : 4,496.81 = 917.91 : x
2. Step 2: Convert to fraction form
   2,997.72/4,496.81 = 917.91/x
3. Step 3: Cross multiply
   2,997.72x = 4,496.81 × 917.91
4. Step 4: Simplify right side
   2,997.72x = 4,127,662.28
5. Step 5: Solve for x
   x = 4,127,662.28/2,997.72
6. Step 6: Final answer
   x = 1,376.93