Finding the Fourth Proportional to 129,693.37, 178,977.17 and 72,336.41

Step by Step Solution

1. Step 1: Write the proportion equation
   129,693.37 : 178,977.17 = 72,336.41 : x
2. Step 2: Convert to fraction form
   129,693.37/178,977.17 = 72,336.41/x
3. Step 3: Cross multiply
   129,693.37x = 178,977.17 × 72,336.41
4. Step 4: Simplify right side
   129,693.37x = 12,946,565,007.33
5. Step 5: Solve for x
   x = 12,946,565,007.33/129,693.37
6. Step 6: Final answer
   x = 99,824.42