Finding the Fourth Proportional to 1,345.78, 1,856.94 and 1,238.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.78 : 1,856.94 = 1,238.24 : x
2. Step 2: Convert to fraction form
   1,345.78/1,856.94 = 1,238.24/x
3. Step 3: Cross multiply
   1,345.78x = 1,856.94 × 1,238.24
4. Step 4: Simplify right side
   1,345.78x = 2,299,337.39
5. Step 5: Solve for x
   x = 2,299,337.39/1,345.78
6. Step 6: Final answer
   x = 1,708.55