Finding the Fourth Proportional to 1,040.07, 1,435.61 and 620.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.07 : 1,435.61 = 620.72 : x
2. Step 2: Convert to fraction form
   1,040.07/1,435.61 = 620.72/x
3. Step 3: Cross multiply
   1,040.07x = 1,435.61 × 620.72
4. Step 4: Simplify right side
   1,040.07x = 891,101.56
5. Step 5: Solve for x
   x = 891,101.56/1,040.07
6. Step 6: Final answer
   x = 856.77