Finding the Fourth Proportional to 1,984.71, 2,738.89 and 1,145.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,984.71 : 2,738.89 = 1,145.40 : x
2. Step 2: Convert to fraction form
   1,984.71/2,738.89 = 1,145.40/x
3. Step 3: Cross multiply
   1,984.71x = 2,738.89 × 1,145.40
4. Step 4: Simplify right side
   1,984.71x = 3,137,124.61
5. Step 5: Solve for x
   x = 3,137,124.61/1,984.71
6. Step 6: Final answer
   x = 1,580.65