Finding the Fourth Proportional to 128,498.40, 192,553.20 and 108,669.60

Step by Step Solution

1. Step 1: Write the proportion equation
   128,498.40 : 192,553.20 = 108,669.60 : x
2. Step 2: Convert to fraction form
   128,498.40/192,553.20 = 108,669.60/x
3. Step 3: Cross multiply
   128,498.40x = 192,553.20 × 108,669.60
4. Step 4: Simplify right side
   128,498.40x = 20,924,679,222.72
5. Step 5: Solve for x
   x = 20,924,679,222.72/128,498.40
6. Step 6: Final answer
   x = 162,840.00