Finding the Fourth Proportional to 2,991.77, 4,487.89 and 911.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,991.77 : 4,487.89 = 911.96 : x
2. Step 2: Convert to fraction form
   2,991.77/4,487.89 = 911.96/x
3. Step 3: Cross multiply
   2,991.77x = 4,487.89 × 911.96
4. Step 4: Simplify right side
   2,991.77x = 4,092,776.16
5. Step 5: Solve for x
   x = 4,092,776.16/2,991.77
6. Step 6: Final answer
   x = 1,368.01