Finding the Fourth Proportional to 1,985.12, 2,738.83 and 1,145.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.12 : 2,738.83 = 1,145.71 : x
2. Step 2: Convert to fraction form
   1,985.12/2,738.83 = 1,145.71/x
3. Step 3: Cross multiply
   1,985.12x = 2,738.83 × 1,145.71
4. Step 4: Simplify right side
   1,985.12x = 3,137,907.78
5. Step 5: Solve for x
   x = 3,137,907.78/1,985.12
6. Step 6: Final answer
   x = 1,580.72