Finding the Fourth Proportional to 1,619.31, 2,234.75 and 920.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,619.31 : 2,234.75 = 920.69 : x
2. Step 2: Convert to fraction form
   1,619.31/2,234.75 = 920.69/x
3. Step 3: Cross multiply
   1,619.31x = 2,234.75 × 920.69
4. Step 4: Simplify right side
   1,619.31x = 2,057,511.98
5. Step 5: Solve for x
   x = 2,057,511.98/1,619.31
6. Step 6: Final answer
   x = 1,270.61