Finding the Fourth Proportional to 1,986.45, 2,981.61 and 1,431.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.45 : 2,981.61 = 1,431.74 : x
2. Step 2: Convert to fraction form
   1,986.45/2,981.61 = 1,431.74/x
3. Step 3: Cross multiply
   1,986.45x = 2,981.61 × 1,431.74
4. Step 4: Simplify right side
   1,986.45x = 4,268,875.39
5. Step 5: Solve for x
   x = 4,268,875.39/1,986.45
6. Step 6: Final answer
   x = 2,149.00