Finding the Fourth Proportional to 2,089.58, 3,131.12 and 1,855.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,089.58 : 3,131.12 = 1,855.78 : x
2. Step 2: Convert to fraction form
   2,089.58/3,131.12 = 1,855.78/x
3. Step 3: Cross multiply
   2,089.58x = 3,131.12 × 1,855.78
4. Step 4: Simplify right side
   2,089.58x = 5,810,669.87
5. Step 5: Solve for x
   x = 5,810,669.87/2,089.58
6. Step 6: Final answer
   x = 2,780.78