Finding the Fourth Proportional to 1,345.20, 1,856.10 and 755.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.20 : 1,856.10 = 755.52 : x
2. Step 2: Convert to fraction form
   1,345.20/1,856.10 = 755.52/x
3. Step 3: Cross multiply
   1,345.20x = 1,856.10 × 755.52
4. Step 4: Simplify right side
   1,345.20x = 1,402,320.67
5. Step 5: Solve for x
   x = 1,402,320.67/1,345.20
6. Step 6: Final answer
   x = 1,042.46