Finding the Fourth Proportional to 129,543.72, 178,769.61 and 72,183.30

Step by Step Solution

1. Step 1: Write the proportion equation
   129,543.72 : 178,769.61 = 72,183.30 : x
2. Step 2: Convert to fraction form
   129,543.72/178,769.61 = 72,183.30/x
3. Step 3: Cross multiply
   129,543.72x = 178,769.61 × 72,183.30
4. Step 4: Simplify right side
   129,543.72x = 12,904,180,389.51
5. Step 5: Solve for x
   x = 12,904,180,389.51/129,543.72
6. Step 6: Final answer
   x = 99,612.55