Finding the Fourth Proportional to 120,588.51, 180,004.50 and 111,694.71

Step by Step Solution

1. Step 1: Write the proportion equation
   120,588.51 : 180,004.50 = 111,694.71 : x
2. Step 2: Convert to fraction form
   120,588.51/180,004.50 = 111,694.71/x
3. Step 3: Cross multiply
   120,588.51x = 180,004.50 × 111,694.71
4. Step 4: Simplify right side
   120,588.51x = 20,105,550,426.20
5. Step 5: Solve for x
   x = 20,105,550,426.20/120,588.51
6. Step 6: Final answer
   x = 166,728.57