Finding the Fourth Proportional to 72,900.60, 109,091.70 and 50,609.40

Step by Step Solution

1. Step 1: Write the proportion equation
   72,900.60 : 109,091.70 = 50,609.40 : x
2. Step 2: Convert to fraction form
   72,900.60/109,091.70 = 50,609.40/x
3. Step 3: Cross multiply
   72,900.60x = 109,091.70 × 50,609.40
4. Step 4: Simplify right side
   72,900.60x = 5,521,065,481.98
5. Step 5: Solve for x
   x = 5,521,065,481.98/72,900.60
6. Step 6: Final answer
   x = 75,734.16