Finding the Fourth Proportional to 1,820.78, 2,513.53 and 1,423.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,820.78 : 2,513.53 = 1,423.02 : x
2. Step 2: Convert to fraction form
   1,820.78/2,513.53 = 1,423.02/x
3. Step 3: Cross multiply
   1,820.78x = 2,513.53 × 1,423.02
4. Step 4: Simplify right side
   1,820.78x = 3,576,800.53
5. Step 5: Solve for x
   x = 3,576,800.53/1,820.78
6. Step 6: Final answer
   x = 1,964.43