Finding the Fourth Proportional to 1,385.76, 2,079.56 and 801.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.76 : 2,079.56 = 801.89 : x
2. Step 2: Convert to fraction form
   1,385.76/2,079.56 = 801.89/x
3. Step 3: Cross multiply
   1,385.76x = 2,079.56 × 801.89
4. Step 4: Simplify right side
   1,385.76x = 1,667,578.37
5. Step 5: Solve for x
   x = 1,667,578.37/1,385.76
6. Step 6: Final answer
   x = 1,203.37