Finding the Fourth Proportional to 129,141.63, 178,215.53 and 72,553.41

Step by Step Solution

1. Step 1: Write the proportion equation
   129,141.63 : 178,215.53 = 72,553.41 : x
2. Step 2: Convert to fraction form
   129,141.63/178,215.53 = 72,553.41/x
3. Step 3: Cross multiply
   129,141.63x = 178,215.53 × 72,553.41
4. Step 4: Simplify right side
   129,141.63x = 12,930,144,053.69
5. Step 5: Solve for x
   x = 12,930,144,053.69/129,141.63
6. Step 6: Final answer
   x = 100,123.75