Finding the Fourth Proportional to 1,980.45, 2,728.89 and 1,349.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.45 : 2,728.89 = 1,349.87 : x
2. Step 2: Convert to fraction form
   1,980.45/2,728.89 = 1,349.87/x
3. Step 3: Cross multiply
   1,980.45x = 2,728.89 × 1,349.87
4. Step 4: Simplify right side
   1,980.45x = 3,683,633.10
5. Step 5: Solve for x
   x = 3,683,633.10/1,980.45
6. Step 6: Final answer
   x = 1,860.00