Finding the Fourth Proportional to 1,619.98, 2,235.56 and 921.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,619.98 : 2,235.56 = 921.34 : x
2. Step 2: Convert to fraction form
   1,619.98/2,235.56 = 921.34/x
3. Step 3: Cross multiply
   1,619.98x = 2,235.56 × 921.34
4. Step 4: Simplify right side
   1,619.98x = 2,059,710.85
5. Step 5: Solve for x
   x = 2,059,710.85/1,619.98
6. Step 6: Final answer
   x = 1,271.44