Finding the Fourth Proportional to 129,681.30, 178,975.59 and 72,330

Step by Step Solution

1. Step 1: Write the proportion equation
   129,681.30 : 178,975.59 = 72,330 : x
2. Step 2: Convert to fraction form
   129,681.30/178,975.59 = 72,330/x
3. Step 3: Cross multiply
   129,681.30x = 178,975.59 × 72,330
4. Step 4: Simplify right side
   129,681.30x = 12,945,304,424.70
5. Step 5: Solve for x
   x = 12,945,304,424.70/129,681.30
6. Step 6: Final answer
   x = 99,823.99