Finding the Fourth Proportional to 1,380.81, 2,071.98 and 1,073.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.81 : 2,071.98 = 1,073.28 : x
2. Step 2: Convert to fraction form
   1,380.81/2,071.98 = 1,073.28/x
3. Step 3: Cross multiply
   1,380.81x = 2,071.98 × 1,073.28
4. Step 4: Simplify right side
   1,380.81x = 2,223,814.69
5. Step 5: Solve for x
   x = 2,223,814.69/1,380.81
6. Step 6: Final answer
   x = 1,610.51