Finding the Fourth Proportional to 1,380.24, 1,903.89 and 875.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.24 : 1,903.89 = 875.91 : x
2. Step 2: Convert to fraction form
   1,380.24/1,903.89 = 875.91/x
3. Step 3: Cross multiply
   1,380.24x = 1,903.89 × 875.91
4. Step 4: Simplify right side
   1,380.24x = 1,667,631.91
5. Step 5: Solve for x
   x = 1,667,631.91/1,380.24
6. Step 6: Final answer
   x = 1,208.22