Finding the Fourth Proportional to 103,769.55, 155,654.37 and 80,111.63

Step by Step Solution

1. Step 1: Write the proportion equation
   103,769.55 : 155,654.37 = 80,111.63 : x
2. Step 2: Convert to fraction form
   103,769.55/155,654.37 = 80,111.63/x
3. Step 3: Cross multiply
   103,769.55x = 155,654.37 × 80,111.63
4. Step 4: Simplify right side
   103,769.55x = 12,469,725,686.46
5. Step 5: Solve for x
   x = 12,469,725,686.46/103,769.55
6. Step 6: Final answer
   x = 120,167.48