Finding the Fourth Proportional to 11,978.07, 17,970.57 and 4,956.79

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.07 : 17,970.57 = 4,956.79 : x
2. Step 2: Convert to fraction form
   11,978.07/17,970.57 = 4,956.79/x
3. Step 3: Cross multiply
   11,978.07x = 17,970.57 × 4,956.79
4. Step 4: Simplify right side
   11,978.07x = 89,076,296.74
5. Step 5: Solve for x
   x = 89,076,296.74/11,978.07
6. Step 6: Final answer
   x = 7,436.62