Finding the Fourth Proportional to 141,258.78, 194,790.15 and 105,391.98

Step by Step Solution

1. Step 1: Write the proportion equation
   141,258.78 : 194,790.15 = 105,391.98 : x
2. Step 2: Convert to fraction form
   141,258.78/194,790.15 = 105,391.98/x
3. Step 3: Cross multiply
   141,258.78x = 194,790.15 × 105,391.98
4. Step 4: Simplify right side
   141,258.78x = 20,529,319,593.00
5. Step 5: Solve for x
   x = 20,529,319,593.00/141,258.78
6. Step 6: Final answer
   x = 145,331.28