Finding the Fourth Proportional to 129,314.63, 178,454.21 and 72,726

Step by Step Solution

1. Step 1: Write the proportion equation
   129,314.63 : 178,454.21 = 72,726 : x
2. Step 2: Convert to fraction form
   129,314.63/178,454.21 = 72,726/x
3. Step 3: Cross multiply
   129,314.63x = 178,454.21 × 72,726
4. Step 4: Simplify right side
   129,314.63x = 12,978,260,876.46
5. Step 5: Solve for x
   x = 12,978,260,876.46/129,314.63
6. Step 6: Final answer
   x = 100,361.89