Finding the Fourth Proportional to 1,010.39, 1,512.78 and 762.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.39 : 1,512.78 = 762.84 : x
2. Step 2: Convert to fraction form
   1,010.39/1,512.78 = 762.84/x
3. Step 3: Cross multiply
   1,010.39x = 1,512.78 × 762.84
4. Step 4: Simplify right side
   1,010.39x = 1,154,009.10
5. Step 5: Solve for x
   x = 1,154,009.10/1,010.39
6. Step 6: Final answer
   x = 1,142.15