Finding the Fourth Proportional to 129,870.76, 179,219.90 and 72,510.96

Step by Step Solution

1. Step 1: Write the proportion equation
   129,870.76 : 179,219.90 = 72,510.96 : x
2. Step 2: Convert to fraction form
   129,870.76/179,219.90 = 72,510.96/x
3. Step 3: Cross multiply
   129,870.76x = 179,219.90 × 72,510.96
4. Step 4: Simplify right side
   129,870.76x = 12,995,407,000.10
5. Step 5: Solve for x
   x = 12,995,407,000.10/129,870.76
6. Step 6: Final answer
   x = 100,064.15