Finding the Fourth Proportional to 129,556.98, 178,785.71 and 72,196.02

Step by Step Solution

1. Step 1: Write the proportion equation
   129,556.98 : 178,785.71 = 72,196.02 : x
2. Step 2: Convert to fraction form
   129,556.98/178,785.71 = 72,196.02/x
3. Step 3: Cross multiply
   129,556.98x = 178,785.71 × 72,196.02
4. Step 4: Simplify right side
   129,556.98x = 12,907,616,604.63
5. Step 5: Solve for x
   x = 12,907,616,604.63/129,556.98
6. Step 6: Final answer
   x = 99,628.88