Finding the Fourth Proportional to 1,057.50, 1,459.35 and 615.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.50 : 1,459.35 = 615.38 : x
2. Step 2: Convert to fraction form
   1,057.50/1,459.35 = 615.38/x
3. Step 3: Cross multiply
   1,057.50x = 1,459.35 × 615.38
4. Step 4: Simplify right side
   1,057.50x = 898,047.51
5. Step 5: Solve for x
   x = 898,047.51/1,057.50
6. Step 6: Final answer
   x = 849.22