Finding the Fourth Proportional to 78,479.34, 116,979.70 and 72,180.78

Step by Step Solution

1. Step 1: Write the proportion equation
   78,479.34 : 116,979.70 = 72,180.78 : x
2. Step 2: Convert to fraction form
   78,479.34/116,979.70 = 72,180.78/x
3. Step 3: Cross multiply
   78,479.34x = 116,979.70 × 72,180.78
4. Step 4: Simplify right side
   78,479.34x = 8,443,685,405.27
5. Step 5: Solve for x
   x = 8,443,685,405.27/78,479.34
6. Step 6: Final answer
   x = 107,591.19