Finding the Fourth Proportional to 1,423.02, 1,963.32 and 855.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.02 : 1,963.32 = 855.60 : x
2. Step 2: Convert to fraction form
   1,423.02/1,963.32 = 855.60/x
3. Step 3: Cross multiply
   1,423.02x = 1,963.32 × 855.60
4. Step 4: Simplify right side
   1,423.02x = 1,679,816.59
5. Step 5: Solve for x
   x = 1,679,816.59/1,423.02
6. Step 6: Final answer
   x = 1,180.46