Finding the Fourth Proportional to 103,145.85, 154,456.20 and 67,978.89

Step by Step Solution

1. Step 1: Write the proportion equation
   103,145.85 : 154,456.20 = 67,978.89 : x
2. Step 2: Convert to fraction form
   103,145.85/154,456.20 = 67,978.89/x
3. Step 3: Cross multiply
   103,145.85x = 154,456.20 × 67,978.89
4. Step 4: Simplify right side
   103,145.85x = 10,499,761,029.62
5. Step 5: Solve for x
   x = 10,499,761,029.62/103,145.85
6. Step 6: Final answer
   x = 101,795.28