Finding the Fourth Proportional to 89,904.21, 123,997.69 and 57,641.91

Step by Step Solution

1. Step 1: Write the proportion equation
   89,904.21 : 123,997.69 = 57,641.91 : x
2. Step 2: Convert to fraction form
   89,904.21/123,997.69 = 57,641.91/x
3. Step 3: Cross multiply
   89,904.21x = 123,997.69 × 57,641.91
4. Step 4: Simplify right side
   89,904.21x = 7,147,463,687.19
5. Step 5: Solve for x
   x = 7,147,463,687.19/89,904.21
6. Step 6: Final answer
   x = 79,500.88