Finding the Fourth Proportional to 1,665.15, 2,293.98 and 1,380.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.15 : 2,293.98 = 1,380.50 : x
2. Step 2: Convert to fraction form
   1,665.15/2,293.98 = 1,380.50/x
3. Step 3: Cross multiply
   1,665.15x = 2,293.98 × 1,380.50
4. Step 4: Simplify right side
   1,665.15x = 3,166,839.39
5. Step 5: Solve for x
   x = 3,166,839.39/1,665.15
6. Step 6: Final answer
   x = 1,901.83