Finding the Fourth Proportional to 1,057.83, 1,459.98 and 615.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.83 : 1,459.98 = 615.99 : x
2. Step 2: Convert to fraction form
   1,057.83/1,459.98 = 615.99/x
3. Step 3: Cross multiply
   1,057.83x = 1,459.98 × 615.99
4. Step 4: Simplify right side
   1,057.83x = 899,333.08
5. Step 5: Solve for x
   x = 899,333.08/1,057.83
6. Step 6: Final answer
   x = 850.17