Finding the Fourth Proportional to 129,443.01, 178,589.64 and 72,843.45

Step by Step Solution

1. Step 1: Write the proportion equation
   129,443.01 : 178,589.64 = 72,843.45 : x
2. Step 2: Convert to fraction form
   129,443.01/178,589.64 = 72,843.45/x
3. Step 3: Cross multiply
   129,443.01x = 178,589.64 × 72,843.45
4. Step 4: Simplify right side
   129,443.01x = 13,009,085,511.86
5. Step 5: Solve for x
   x = 13,009,085,511.86/129,443.01
6. Step 6: Final answer
   x = 100,500.49