Finding the Fourth Proportional to 1,057.87, 1,459.72 and 615.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.87 : 1,459.72 = 615.84 : x
2. Step 2: Convert to fraction form
   1,057.87/1,459.72 = 615.84/x
3. Step 3: Cross multiply
   1,057.87x = 1,459.72 × 615.84
4. Step 4: Simplify right side
   1,057.87x = 898,953.96
5. Step 5: Solve for x
   x = 898,953.96/1,057.87
6. Step 6: Final answer
   x = 849.78