Finding the Fourth Proportional to 2,080.54, 3,121.34 and 619.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.54 : 3,121.34 = 619.69 : x
2. Step 2: Convert to fraction form
   2,080.54/3,121.34 = 619.69/x
3. Step 3: Cross multiply
   2,080.54x = 3,121.34 × 619.69
4. Step 4: Simplify right side
   2,080.54x = 1,934,263.18
5. Step 5: Solve for x
   x = 1,934,263.18/2,080.54
6. Step 6: Final answer
   x = 929.69