Finding the Fourth Proportional to 120,970, 166,938.60 and 67,978

Step by Step Solution

1. Step 1: Write the proportion equation
   120,970 : 166,938.60 = 67,978 : x
2. Step 2: Convert to fraction form
   120,970/166,938.60 = 67,978/x
3. Step 3: Cross multiply
   120,970x = 166,938.60 × 67,978
4. Step 4: Simplify right side
   120,970x = 11,348,152,150.80
5. Step 5: Solve for x
   x = 11,348,152,150.80/120,970
6. Step 6: Final answer
   x = 93,809.64