Finding the Fourth Proportional to 2,899.78, 3,999.23 and 2,017.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,899.78 : 3,999.23 = 2,017.69 : x
2. Step 2: Convert to fraction form
   2,899.78/3,999.23 = 2,017.69/x
3. Step 3: Cross multiply
   2,899.78x = 3,999.23 × 2,017.69
4. Step 4: Simplify right side
   2,899.78x = 8,069,195.07
5. Step 5: Solve for x
   x = 8,069,195.07/2,899.78
6. Step 6: Final answer
   x = 2,782.69