Finding the Fourth Proportional to 2,031.58, 3,048.31 and 920.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,031.58 : 3,048.31 = 920.80 : x
2. Step 2: Convert to fraction form
   2,031.58/3,048.31 = 920.80/x
3. Step 3: Cross multiply
   2,031.58x = 3,048.31 × 920.80
4. Step 4: Simplify right side
   2,031.58x = 2,806,868.61
5. Step 5: Solve for x
   x = 2,806,868.61/2,031.58
6. Step 6: Final answer
   x = 1,381.62