Finding the Fourth Proportional to 1,285.89, 1,927.18 and 1,112.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,285.89 : 1,927.18 = 1,112.55 : x
2. Step 2: Convert to fraction form
   1,285.89/1,927.18 = 1,112.55/x
3. Step 3: Cross multiply
   1,285.89x = 1,927.18 × 1,112.55
4. Step 4: Simplify right side
   1,285.89x = 2,144,084.11
5. Step 5: Solve for x
   x = 2,144,084.11/1,285.89
6. Step 6: Final answer
   x = 1,667.39