Finding the Fourth Proportional to 123,855, 170,951.70 and 75,489.72

Step by Step Solution

1. Step 1: Write the proportion equation
   123,855 : 170,951.70 = 75,489.72 : x
2. Step 2: Convert to fraction form
   123,855/170,951.70 = 75,489.72/x
3. Step 3: Cross multiply
   123,855x = 170,951.70 × 75,489.72
4. Step 4: Simplify right side
   123,855x = 12,905,095,966.52
5. Step 5: Solve for x
   x = 12,905,095,966.52/123,855
6. Step 6: Final answer
   x = 104,195.20