Finding the Fourth Proportional to 2,507.57, 3,759.99 and 1,990.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.57 : 3,759.99 = 1,990.89 : x
2. Step 2: Convert to fraction form
   2,507.57/3,759.99 = 1,990.89/x
3. Step 3: Cross multiply
   2,507.57x = 3,759.99 × 1,990.89
4. Step 4: Simplify right side
   2,507.57x = 7,485,719.03
5. Step 5: Solve for x
   x = 7,485,719.03/2,507.57
6. Step 6: Final answer
   x = 2,985.25