Finding the Fourth Proportional to 2,678.35, 4,018.42 and 1,291.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,678.35 : 4,018.42 = 1,291.50 : x
2. Step 2: Convert to fraction form
   2,678.35/4,018.42 = 1,291.50/x
3. Step 3: Cross multiply
   2,678.35x = 4,018.42 × 1,291.50
4. Step 4: Simplify right side
   2,678.35x = 5,189,808.51
5. Step 5: Solve for x
   x = 5,189,808.51/2,678.35
6. Step 6: Final answer
   x = 1,937.69