Finding the Fourth Proportional to 1,057.98, 1,460.25 and 615.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.98 : 1,460.25 = 615.95 : x
2. Step 2: Convert to fraction form
   1,057.98/1,460.25 = 615.95/x
3. Step 3: Cross multiply
   1,057.98x = 1,460.25 × 615.95
4. Step 4: Simplify right side
   1,057.98x = 899,433.69
5. Step 5: Solve for x
   x = 899,433.69/1,057.98
6. Step 6: Final answer
   x = 850.14