Finding the Fourth Proportional to 2,650.31, 3,977.28 and 918.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,650.31 : 3,977.28 = 918.93 : x
2. Step 2: Convert to fraction form
   2,650.31/3,977.28 = 918.93/x
3. Step 3: Cross multiply
   2,650.31x = 3,977.28 × 918.93
4. Step 4: Simplify right side
   2,650.31x = 3,654,848.03
5. Step 5: Solve for x
   x = 3,654,848.03/2,650.31
6. Step 6: Final answer
   x = 1,379.03