Finding the Fourth Proportional to 1,996.78, 2,994.78 and 763.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,996.78 : 2,994.78 = 763.89 : x
2. Step 2: Convert to fraction form
   1,996.78/2,994.78 = 763.89/x
3. Step 3: Cross multiply
   1,996.78x = 2,994.78 × 763.89
4. Step 4: Simplify right side
   1,996.78x = 2,287,678.67
5. Step 5: Solve for x
   x = 2,287,678.67/1,996.78
6. Step 6: Final answer
   x = 1,145.69