Finding the Fourth Proportional to 123,845, 170,907.78 and 70,128.86

Step by Step Solution

1. Step 1: Write the proportion equation
   123,845 : 170,907.78 = 70,128.86 : x
2. Step 2: Convert to fraction form
   123,845/170,907.78 = 70,128.86/x
3. Step 3: Cross multiply
   123,845x = 170,907.78 × 70,128.86
4. Step 4: Simplify right side
   123,845x = 11,985,567,776.53
5. Step 5: Solve for x
   x = 11,985,567,776.53/123,845
6. Step 6: Final answer
   x = 96,778.78