Finding the Fourth Proportional to 123,678.54, 170,656.80 and 72,734.94

Step by Step Solution

1. Step 1: Write the proportion equation
   123,678.54 : 170,656.80 = 72,734.94 : x
2. Step 2: Convert to fraction form
   123,678.54/170,656.80 = 72,734.94/x
3. Step 3: Cross multiply
   123,678.54x = 170,656.80 × 72,734.94
4. Step 4: Simplify right side
   123,678.54x = 12,412,712,108.59
5. Step 5: Solve for x
   x = 12,412,712,108.59/123,678.54
6. Step 6: Final answer
   x = 100,362.70