Finding the Fourth Proportional to 2,991.89, 4,488.06 and 912.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,991.89 : 4,488.06 = 912.07 : x
2. Step 2: Convert to fraction form
   2,991.89/4,488.06 = 912.07/x
3. Step 3: Cross multiply
   2,991.89x = 4,488.06 × 912.07
4. Step 4: Simplify right side
   2,991.89x = 4,093,424.88
5. Step 5: Solve for x
   x = 4,093,424.88/2,991.89
6. Step 6: Final answer
   x = 1,368.17