Finding the Fourth Proportional to 121,667.55, 168,016.71 and 115,040.94

Step by Step Solution

1. Step 1: Write the proportion equation
   121,667.55 : 168,016.71 = 115,040.94 : x
2. Step 2: Convert to fraction form
   121,667.55/168,016.71 = 115,040.94/x
3. Step 3: Cross multiply
   121,667.55x = 168,016.71 × 115,040.94
4. Step 4: Simplify right side
   121,667.55x = 19,328,800,254.11
5. Step 5: Solve for x
   x = 19,328,800,254.11/121,667.55
6. Step 6: Final answer
   x = 158,865.70