Finding the Fourth Proportional to 2,007.60, 3,011.72 and 620.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.60 : 3,011.72 = 620.61 : x
2. Step 2: Convert to fraction form
   2,007.60/3,011.72 = 620.61/x
3. Step 3: Cross multiply
   2,007.60x = 3,011.72 × 620.61
4. Step 4: Simplify right side
   2,007.60x = 1,869,103.55
5. Step 5: Solve for x
   x = 1,869,103.55/2,007.60
6. Step 6: Final answer
   x = 931.01