Finding the Fourth Proportional to 1,320.63, 1,820.37 and 1,040.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.63 : 1,820.37 = 1,040.43 : x
2. Step 2: Convert to fraction form
   1,320.63/1,820.37 = 1,040.43/x
3. Step 3: Cross multiply
   1,320.63x = 1,820.37 × 1,040.43
4. Step 4: Simplify right side
   1,320.63x = 1,893,967.56
5. Step 5: Solve for x
   x = 1,893,967.56/1,320.63
6. Step 6: Final answer
   x = 1,434.14