Finding the Fourth Proportional to 1,243.31, 1,865.15 and 377.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.31 : 1,865.15 = 377.69 : x
2. Step 2: Convert to fraction form
   1,243.31/1,865.15 = 377.69/x
3. Step 3: Cross multiply
   1,243.31x = 1,865.15 × 377.69
4. Step 4: Simplify right side
   1,243.31x = 704,448.50
5. Step 5: Solve for x
   x = 704,448.50/1,243.31
6. Step 6: Final answer
   x = 566.59