Finding the Fourth Proportional to 2,080.35, 3,120.42 and 619.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.35 : 3,120.42 = 619.50 : x
2. Step 2: Convert to fraction form
   2,080.35/3,120.42 = 619.50/x
3. Step 3: Cross multiply
   2,080.35x = 3,120.42 × 619.50
4. Step 4: Simplify right side
   2,080.35x = 1,933,100.19
5. Step 5: Solve for x
   x = 1,933,100.19/2,080.35
6. Step 6: Final answer
   x = 929.22