Finding the Fourth Proportional to 129,379.89, 178,544.20 and 72,017.96

Step by Step Solution

1. Step 1: Write the proportion equation
   129,379.89 : 178,544.20 = 72,017.96 : x
2. Step 2: Convert to fraction form
   129,379.89/178,544.20 = 72,017.96/x
3. Step 3: Cross multiply
   129,379.89x = 178,544.20 × 72,017.96
4. Step 4: Simplify right side
   129,379.89x = 12,858,389,053.83
5. Step 5: Solve for x
   x = 12,858,389,053.83/129,379.89
6. Step 6: Final answer
   x = 99,384.76