Finding the Fourth Proportional to 118,081.70, 177,007.35 and 105,640.10

Step by Step Solution

1. Step 1: Write the proportion equation
   118,081.70 : 177,007.35 = 105,640.10 : x
2. Step 2: Convert to fraction form
   118,081.70/177,007.35 = 105,640.10/x
3. Step 3: Cross multiply
   118,081.70x = 177,007.35 × 105,640.10
4. Step 4: Simplify right side
   118,081.70x = 18,699,074,154.74
5. Step 5: Solve for x
   x = 18,699,074,154.74/118,081.70
6. Step 6: Final answer
   x = 158,357.09