Finding the Fourth Proportional to 129,029.92, 178,056.72 and 72,443.68

Step by Step Solution

1. Step 1: Write the proportion equation
   129,029.92 : 178,056.72 = 72,443.68 : x
2. Step 2: Convert to fraction form
   129,029.92/178,056.72 = 72,443.68/x
3. Step 3: Cross multiply
   129,029.92x = 178,056.72 × 72,443.68
4. Step 4: Simplify right side
   129,029.92x = 12,899,084,045.53
5. Step 5: Solve for x
   x = 12,899,084,045.53/129,029.92
6. Step 6: Final answer
   x = 99,969.71