Finding the Fourth Proportional to 2,007.15, 3,009.39 and 620.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.15 : 3,009.39 = 620.01 : x
2. Step 2: Convert to fraction form
   2,007.15/3,009.39 = 620.01/x
3. Step 3: Cross multiply
   2,007.15x = 3,009.39 × 620.01
4. Step 4: Simplify right side
   2,007.15x = 1,865,851.89
5. Step 5: Solve for x
   x = 1,865,851.89/2,007.15
6. Step 6: Final answer
   x = 929.60