Finding the Fourth Proportional to 2,991.51, 4,128.38 and 1,665.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,991.51 : 4,128.38 = 1,665.18 : x
2. Step 2: Convert to fraction form
   2,991.51/4,128.38 = 1,665.18/x
3. Step 3: Cross multiply
   2,991.51x = 4,128.38 × 1,665.18
4. Step 4: Simplify right side
   2,991.51x = 6,874,495.81
5. Step 5: Solve for x
   x = 6,874,495.81/2,991.51
6. Step 6: Final answer
   x = 2,298.00