Finding the Fourth Proportional to 381,817.98, 572,728.35 and 129,100.56

Step by Step Solution

1. Step 1: Write the proportion equation
   381,817.98 : 572,728.35 = 129,100.56 : x
2. Step 2: Convert to fraction form
   381,817.98/572,728.35 = 129,100.56/x
3. Step 3: Cross multiply
   381,817.98x = 572,728.35 × 129,100.56
4. Step 4: Simplify right side
   381,817.98x = 73,939,550,712.88
5. Step 5: Solve for x
   x = 73,939,550,712.88/381,817.98
6. Step 6: Final answer
   x = 193,651.31