Finding the Fourth Proportional to 137,604.89, 189,807.33 and 99,420.54

Step by Step Solution

1. Step 1: Write the proportion equation
   137,604.89 : 189,807.33 = 99,420.54 : x
2. Step 2: Convert to fraction form
   137,604.89/189,807.33 = 99,420.54/x
3. Step 3: Cross multiply
   137,604.89x = 189,807.33 × 99,420.54
4. Step 4: Simplify right side
   137,604.89x = 18,870,747,244.56
5. Step 5: Solve for x
   x = 18,870,747,244.56/137,604.89
6. Step 6: Final answer
   x = 137,137.19