Finding the Fourth Proportional to 129,776.53, 179,086.58 and 72,412.87

Step by Step Solution

1. Step 1: Write the proportion equation
   129,776.53 : 179,086.58 = 72,412.87 : x
2. Step 2: Convert to fraction form
   129,776.53/179,086.58 = 72,412.87/x
3. Step 3: Cross multiply
   129,776.53x = 179,086.58 × 72,412.87
4. Step 4: Simplify right side
   129,776.53x = 12,968,171,978.79
5. Step 5: Solve for x
   x = 12,968,171,978.79/129,776.53
6. Step 6: Final answer
   x = 99,926.95