Finding the Fourth Proportional to 129,018.92, 193,181.50 and 105,228.31

Step by Step Solution

1. Step 1: Write the proportion equation
   129,018.92 : 193,181.50 = 105,228.31 : x
2. Step 2: Convert to fraction form
   129,018.92/193,181.50 = 105,228.31/x
3. Step 3: Cross multiply
   129,018.92x = 193,181.50 × 105,228.31
4. Step 4: Simplify right side
   129,018.92x = 20,328,162,242.12
5. Step 5: Solve for x
   x = 20,328,162,242.12/129,018.92
6. Step 6: Final answer
   x = 157,559.54