Finding the Fourth Proportional to 120,619.84, 166,433.86 and 72,841.20

Step by Step Solution

1. Step 1: Write the proportion equation
   120,619.84 : 166,433.86 = 72,841.20 : x
2. Step 2: Convert to fraction form
   120,619.84/166,433.86 = 72,841.20/x
3. Step 3: Cross multiply
   120,619.84x = 166,433.86 × 72,841.20
4. Step 4: Simplify right side
   120,619.84x = 12,123,242,083.03
5. Step 5: Solve for x
   x = 12,123,242,083.03/120,619.84
6. Step 6: Final answer
   x = 100,507.86