Finding the Fourth Proportional to 2,991.75, 4,128.71 and 1,872.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,991.75 : 4,128.71 = 1,872.33 : x
2. Step 2: Convert to fraction form
   2,991.75/4,128.71 = 1,872.33/x
3. Step 3: Cross multiply
   2,991.75x = 4,128.71 × 1,872.33
4. Step 4: Simplify right side
   2,991.75x = 7,730,307.59
5. Step 5: Solve for x
   x = 7,730,307.59/2,991.75
6. Step 6: Final answer
   x = 2,583.87