Finding the Fourth Proportional to 1,002.15, 1,501.98 and 453.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.15 : 1,501.98 = 453.78 : x
2. Step 2: Convert to fraction form
   1,002.15/1,501.98 = 453.78/x
3. Step 3: Cross multiply
   1,002.15x = 1,501.98 × 453.78
4. Step 4: Simplify right side
   1,002.15x = 681,568.48
5. Step 5: Solve for x
   x = 681,568.48/1,002.15
6. Step 6: Final answer
   x = 680.11