Finding the Fourth Proportional to 12,994.78, 17,933.12 and 7,961.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,994.78 : 17,933.12 = 7,961.78 : x
2. Step 2: Convert to fraction form
   12,994.78/17,933.12 = 7,961.78/x
3. Step 3: Cross multiply
   12,994.78x = 17,933.12 × 7,961.78
4. Step 4: Simplify right side
   12,994.78x = 142,779,486.39
5. Step 5: Solve for x
   x = 142,779,486.39/12,994.78
6. Step 6: Final answer
   x = 10,987.45