Finding the Fourth Proportional to 2,991.79, 4,128.82 and 1,665.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,991.79 : 4,128.82 = 1,665.47 : x
2. Step 2: Convert to fraction form
   2,991.79/4,128.82 = 1,665.47/x
3. Step 3: Cross multiply
   2,991.79x = 4,128.82 × 1,665.47
4. Step 4: Simplify right side
   2,991.79x = 6,876,429.76
5. Step 5: Solve for x
   x = 6,876,429.76/2,991.79
6. Step 6: Final answer
   x = 2,298.43