Finding the Fourth Proportional to 147,378.72, 221,046.55 and 72,478.76

Step by Step Solution

1. Step 1: Write the proportion equation
   147,378.72 : 221,046.55 = 72,478.76 : x
2. Step 2: Convert to fraction form
   147,378.72/221,046.55 = 72,478.76/x
3. Step 3: Cross multiply
   147,378.72x = 221,046.55 × 72,478.76
4. Step 4: Simplify right side
   147,378.72x = 16,021,180,217.70
5. Step 5: Solve for x
   x = 16,021,180,217.70/147,378.72
6. Step 6: Final answer
   x = 108,707.55