Finding the Fourth Proportional to 89,679, 123,715.44 and 57,858.12

Step by Step Solution

1. Step 1: Write the proportion equation
   89,679 : 123,715.44 = 57,858.12 : x
2. Step 2: Convert to fraction form
   89,679/123,715.44 = 57,858.12/x
3. Step 3: Cross multiply
   89,679x = 123,715.44 × 57,858.12
4. Step 4: Simplify right side
   89,679x = 7,157,942,773.37
5. Step 5: Solve for x
   x = 7,157,942,773.37/89,679
6. Step 6: Final answer
   x = 79,817.38