Finding the Fourth Proportional to 122,838.56, 169,609.61 and 120,876.79

Step by Step Solution

1. Step 1: Write the proportion equation
   122,838.56 : 169,609.61 = 120,876.79 : x
2. Step 2: Convert to fraction form
   122,838.56/169,609.61 = 120,876.79/x
3. Step 3: Cross multiply
   122,838.56x = 169,609.61 × 120,876.79
4. Step 4: Simplify right side
   122,838.56x = 20,501,865,209.95
5. Step 5: Solve for x
   x = 20,501,865,209.95/122,838.56
6. Step 6: Final answer
   x = 166,900.89