Finding the Fourth Proportional to 219,903.72, 303,499.76 and 139,338.78

Step by Step Solution

1. Step 1: Write the proportion equation
   219,903.72 : 303,499.76 = 139,338.78 : x
2. Step 2: Convert to fraction form
   219,903.72/303,499.76 = 139,338.78/x
3. Step 3: Cross multiply
   219,903.72x = 303,499.76 × 139,338.78
4. Step 4: Simplify right side
   219,903.72x = 42,289,285,592.00
5. Step 5: Solve for x
   x = 42,289,285,592.00/219,903.72
6. Step 6: Final answer
   x = 192,308.19