Finding the Fourth Proportional to 221,667.30, 305,908.20 and 121,065.30

Step by Step Solution

1. Step 1: Write the proportion equation
   221,667.30 : 305,908.20 = 121,065.30 : x
2. Step 2: Convert to fraction form
   221,667.30/305,908.20 = 121,065.30/x
3. Step 3: Cross multiply
   221,667.30x = 305,908.20 × 121,065.30
4. Step 4: Simplify right side
   221,667.30x = 37,034,868,005.46
5. Step 5: Solve for x
   x = 37,034,868,005.46/221,667.30
6. Step 6: Final answer
   x = 167,074.12