Finding the Fourth Proportional to 2,885.50, 3,980.37 and 1,890.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,885.50 : 3,980.37 = 1,890.55 : x
2. Step 2: Convert to fraction form
   2,885.50/3,980.37 = 1,890.55/x
3. Step 3: Cross multiply
   2,885.50x = 3,980.37 × 1,890.55
4. Step 4: Simplify right side
   2,885.50x = 7,525,088.50
5. Step 5: Solve for x
   x = 7,525,088.50/2,885.50
6. Step 6: Final answer
   x = 2,607.90