Finding the Fourth Proportional to 128,379.50, 177,104.06 and 83,072.09

Step by Step Solution

1. Step 1: Write the proportion equation
   128,379.50 : 177,104.06 = 83,072.09 : x
2. Step 2: Convert to fraction form
   128,379.50/177,104.06 = 83,072.09/x
3. Step 3: Cross multiply
   128,379.50x = 177,104.06 × 83,072.09
4. Step 4: Simplify right side
   128,379.50x = 14,712,404,411.69
5. Step 5: Solve for x
   x = 14,712,404,411.69/128,379.50
6. Step 6: Final answer
   x = 114,600.89