Finding the Fourth Proportional to 12,356.63, 17,048.58 and 6,978.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,356.63 : 17,048.58 = 6,978.78 : x
2. Step 2: Convert to fraction form
   12,356.63/17,048.58 = 6,978.78/x
3. Step 3: Cross multiply
   12,356.63x = 17,048.58 × 6,978.78
4. Step 4: Simplify right side
   12,356.63x = 118,978,262.96
5. Step 5: Solve for x
   x = 118,978,262.96/12,356.63
6. Step 6: Final answer
   x = 9,628.70