Finding the Fourth Proportional to 2,080.47, 3,120.72 and 619.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.47 : 3,120.72 = 619.65 : x
2. Step 2: Convert to fraction form
   2,080.47/3,120.72 = 619.65/x
3. Step 3: Cross multiply
   2,080.47x = 3,120.72 × 619.65
4. Step 4: Simplify right side
   2,080.47x = 1,933,754.15
5. Step 5: Solve for x
   x = 1,933,754.15/2,080.47
6. Step 6: Final answer
   x = 929.48