Finding the Fourth Proportional to 120,395.39, 166,146.87 and 72,639.52

Step by Step Solution

1. Step 1: Write the proportion equation
   120,395.39 : 166,146.87 = 72,639.52 : x
2. Step 2: Convert to fraction form
   120,395.39/166,146.87 = 72,639.52/x
3. Step 3: Cross multiply
   120,395.39x = 166,146.87 × 72,639.52
4. Step 4: Simplify right side
   120,395.39x = 12,068,828,886.30
5. Step 5: Solve for x
   x = 12,068,828,886.30/120,395.39
6. Step 6: Final answer
   x = 100,243.28