Finding the Fourth Proportional to 105,067.30, 157,428.15 and 87,441.70

Step by Step Solution

1. Step 1: Write the proportion equation
   105,067.30 : 157,428.15 = 87,441.70 : x
2. Step 2: Convert to fraction form
   105,067.30/157,428.15 = 87,441.70/x
3. Step 3: Cross multiply
   105,067.30x = 157,428.15 × 87,441.70
4. Step 4: Simplify right side
   105,067.30x = 13,765,785,063.86
5. Step 5: Solve for x
   x = 13,765,785,063.86/105,067.30
6. Step 6: Final answer
   x = 131,018.74