Finding the Fourth Proportional to 1,077.34, 1,485.76 and 911.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.34 : 1,485.76 = 911.38 : x
2. Step 2: Convert to fraction form
   1,077.34/1,485.76 = 911.38/x
3. Step 3: Cross multiply
   1,077.34x = 1,485.76 × 911.38
4. Step 4: Simplify right side
   1,077.34x = 1,354,091.95
5. Step 5: Solve for x
   x = 1,354,091.95/1,077.34
6. Step 6: Final answer
   x = 1,256.88