Finding the Fourth Proportional to 113,105.80, 169,431.90 and 70,856.20

Step by Step Solution

1. Step 1: Write the proportion equation
   113,105.80 : 169,431.90 = 70,856.20 : x
2. Step 2: Convert to fraction form
   113,105.80/169,431.90 = 70,856.20/x
3. Step 3: Cross multiply
   113,105.80x = 169,431.90 × 70,856.20
4. Step 4: Simplify right side
   113,105.80x = 12,005,300,592.78
5. Step 5: Solve for x
   x = 12,005,300,592.78/113,105.80
6. Step 6: Final answer
   x = 106,142.22