Finding the Fourth Proportional to 129,466.72, 178,658.64 and 72,876

Step by Step Solution

1. Step 1: Write the proportion equation
   129,466.72 : 178,658.64 = 72,876 : x
2. Step 2: Convert to fraction form
   129,466.72/178,658.64 = 72,876/x
3. Step 3: Cross multiply
   129,466.72x = 178,658.64 × 72,876
4. Step 4: Simplify right side
   129,466.72x = 13,019,927,048.64
5. Step 5: Solve for x
   x = 13,019,927,048.64/129,466.72
6. Step 6: Final answer
   x = 100,565.82