Finding the Fourth Proportional to 103,520.38, 155,031.33 and 70,139.23

Step by Step Solution

1. Step 1: Write the proportion equation
   103,520.38 : 155,031.33 = 70,139.23 : x
2. Step 2: Convert to fraction form
   103,520.38/155,031.33 = 70,139.23/x
3. Step 3: Cross multiply
   103,520.38x = 155,031.33 × 70,139.23
4. Step 4: Simplify right side
   103,520.38x = 10,873,778,859.57
5. Step 5: Solve for x
   x = 10,873,778,859.57/103,520.38
6. Step 6: Final answer
   x = 105,039.98