Finding the Fourth Proportional to 1,548.16, 2,135.77 and 918.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,548.16 : 2,135.77 = 918.72 : x
2. Step 2: Convert to fraction form
   1,548.16/2,135.77 = 918.72/x
3. Step 3: Cross multiply
   1,548.16x = 2,135.77 × 918.72
4. Step 4: Simplify right side
   1,548.16x = 1,962,166.31
5. Step 5: Solve for x
   x = 1,962,166.31/1,548.16
6. Step 6: Final answer
   x = 1,267.42