Finding the Fourth Proportional to 1,980.69, 2,732.57 and 1,272.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.69 : 2,732.57 = 1,272.43 : x
2. Step 2: Convert to fraction form
   1,980.69/2,732.57 = 1,272.43/x
3. Step 3: Cross multiply
   1,980.69x = 2,732.57 × 1,272.43
4. Step 4: Simplify right side
   1,980.69x = 3,477,000.86
5. Step 5: Solve for x
   x = 3,477,000.86/1,980.69
6. Step 6: Final answer
   x = 1,755.45