Finding the Fourth Proportional to 1,385.42, 1,912.07 and 888.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.42 : 1,912.07 = 888.62 : x
2. Step 2: Convert to fraction form
   1,385.42/1,912.07 = 888.62/x
3. Step 3: Cross multiply
   1,385.42x = 1,912.07 × 888.62
4. Step 4: Simplify right side
   1,385.42x = 1,699,096.30
5. Step 5: Solve for x
   x = 1,699,096.30/1,385.42
6. Step 6: Final answer
   x = 1,226.42