Finding the Fourth Proportional to 2,003.10, 2,990.01 and 1,858.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,003.10 : 2,990.01 = 1,858.56 : x
2. Step 2: Convert to fraction form
   2,003.10/2,990.01 = 1,858.56/x
3. Step 3: Cross multiply
   2,003.10x = 2,990.01 × 1,858.56
4. Step 4: Simplify right side
   2,003.10x = 5,557,112.99
5. Step 5: Solve for x
   x = 5,557,112.99/2,003.10
6. Step 6: Final answer
   x = 2,774.26