Finding the Fourth Proportional to 113,858.79, 171,161.82 and 105,638.10

Step by Step Solution

1. Step 1: Write the proportion equation
   113,858.79 : 171,161.82 = 105,638.10 : x
2. Step 2: Convert to fraction form
   113,858.79/171,161.82 = 105,638.10/x
3. Step 3: Cross multiply
   113,858.79x = 171,161.82 × 105,638.10
4. Step 4: Simplify right side
   113,858.79x = 18,081,209,457.34
5. Step 5: Solve for x
   x = 18,081,209,457.34/113,858.79
6. Step 6: Final answer
   x = 158,803.81