Finding the Fourth Proportional to 2,991.89, 4,488.51 and 912.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,991.89 : 4,488.51 = 912.08 : x
2. Step 2: Convert to fraction form
   2,991.89/4,488.51 = 912.08/x
3. Step 3: Cross multiply
   2,991.89x = 4,488.51 × 912.08
4. Step 4: Simplify right side
   2,991.89x = 4,093,857.76
5. Step 5: Solve for x
   x = 4,093,857.76/2,991.89
6. Step 6: Final answer
   x = 1,368.32