Finding the Fourth Proportional to 123,784.58, 170,796.42 and 72,778.68

Step by Step Solution

1. Step 1: Write the proportion equation
   123,784.58 : 170,796.42 = 72,778.68 : x
2. Step 2: Convert to fraction form
   123,784.58/170,796.42 = 72,778.68/x
3. Step 3: Cross multiply
   123,784.58x = 170,796.42 × 72,778.68
4. Step 4: Simplify right side
   123,784.58x = 12,430,337,996.33
5. Step 5: Solve for x
   x = 12,430,337,996.33/123,784.58
6. Step 6: Final answer
   x = 100,419.11