Finding the Fourth Proportional to 123,780.38, 170,817.12 and 67,191.75

Step by Step Solution

1. Step 1: Write the proportion equation
   123,780.38 : 170,817.12 = 67,191.75 : x
2. Step 2: Convert to fraction form
   123,780.38/170,817.12 = 67,191.75/x
3. Step 3: Cross multiply
   123,780.38x = 170,817.12 × 67,191.75
4. Step 4: Simplify right side
   123,780.38x = 11,477,501,222.76
5. Step 5: Solve for x
   x = 11,477,501,222.76/123,780.38
6. Step 6: Final answer
   x = 92,724.72