Finding the Fourth Proportional to 1,385.38, 1,912.52 and 881.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.38 : 1,912.52 = 881.74 : x
2. Step 2: Convert to fraction form
   1,385.38/1,912.52 = 881.74/x
3. Step 3: Cross multiply
   1,385.38x = 1,912.52 × 881.74
4. Step 4: Simplify right side
   1,385.38x = 1,686,356.60
5. Step 5: Solve for x
   x = 1,686,356.60/1,385.38
6. Step 6: Final answer
   x = 1,217.25