Finding the Fourth Proportional to 1,380.05, 1,903.71 and 874.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.05 : 1,903.71 = 874.98 : x
2. Step 2: Convert to fraction form
   1,380.05/1,903.71 = 874.98/x
3. Step 3: Cross multiply
   1,380.05x = 1,903.71 × 874.98
4. Step 4: Simplify right side
   1,380.05x = 1,665,708.18
5. Step 5: Solve for x
   x = 1,665,708.18/1,380.05
6. Step 6: Final answer
   x = 1,206.99