Finding the Fourth Proportional to 1,345.39, 1,856.18 and 755.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.39 : 1,856.18 = 755.80 : x
2. Step 2: Convert to fraction form
   1,345.39/1,856.18 = 755.80/x
3. Step 3: Cross multiply
   1,345.39x = 1,856.18 × 755.80
4. Step 4: Simplify right side
   1,345.39x = 1,402,898.09
5. Step 5: Solve for x
   x = 1,402,898.09/1,345.39
6. Step 6: Final answer
   x = 1,042.75