Finding the Fourth Proportional to 123,996.78, 170,811.86 and 89,905.10

Step by Step Solution

1. Step 1: Write the proportion equation
   123,996.78 : 170,811.86 = 89,905.10 : x
2. Step 2: Convert to fraction form
   123,996.78/170,811.86 = 89,905.10/x
3. Step 3: Cross multiply
   123,996.78x = 170,811.86 × 89,905.10
4. Step 4: Simplify right side
   123,996.78x = 15,356,856,050.90
5. Step 5: Solve for x
   x = 15,356,856,050.90/123,996.78
6. Step 6: Final answer
   x = 123,848.83