Finding the Fourth Proportional to 1,890.61, 2,608.20 and 1,104.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,890.61 : 2,608.20 = 1,104.31 : x
2. Step 2: Convert to fraction form
   1,890.61/2,608.20 = 1,104.31/x
3. Step 3: Cross multiply
   1,890.61x = 2,608.20 × 1,104.31
4. Step 4: Simplify right side
   1,890.61x = 2,880,261.34
5. Step 5: Solve for x
   x = 2,880,261.34/1,890.61
6. Step 6: Final answer
   x = 1,523.46