Finding the Fourth Proportional to 129,681.50, 178,956.89 and 72,322.56

Step by Step Solution

1. Step 1: Write the proportion equation
   129,681.50 : 178,956.89 = 72,322.56 : x
2. Step 2: Convert to fraction form
   129,681.50/178,956.89 = 72,322.56/x
3. Step 3: Cross multiply
   129,681.50x = 178,956.89 × 72,322.56
4. Step 4: Simplify right side
   129,681.50x = 12,942,620,052.83
5. Step 5: Solve for x
   x = 12,942,620,052.83/129,681.50
6. Step 6: Final answer
   x = 99,803.14