Finding the Fourth Proportional to 1,345.25, 1,856.61 and 848.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.25 : 1,856.61 = 848.31 : x
2. Step 2: Convert to fraction form
   1,345.25/1,856.61 = 848.31/x
3. Step 3: Cross multiply
   1,345.25x = 1,856.61 × 848.31
4. Step 4: Simplify right side
   1,345.25x = 1,574,980.83
5. Step 5: Solve for x
   x = 1,574,980.83/1,345.25
6. Step 6: Final answer
   x = 1,170.78