Finding the Fourth Proportional to 1,010.63, 1,513.51 and 685.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.63 : 1,513.51 = 685.01 : x
2. Step 2: Convert to fraction form
   1,010.63/1,513.51 = 685.01/x
3. Step 3: Cross multiply
   1,010.63x = 1,513.51 × 685.01
4. Step 4: Simplify right side
   1,010.63x = 1,036,769.49
5. Step 5: Solve for x
   x = 1,036,769.49/1,010.63
6. Step 6: Final answer
   x = 1,025.86