Finding the Fourth Proportional to 89,196.39, 123,155.59 and 57,420.64

Step by Step Solution

1. Step 1: Write the proportion equation
   89,196.39 : 123,155.59 = 57,420.64 : x
2. Step 2: Convert to fraction form
   89,196.39/123,155.59 = 57,420.64/x
3. Step 3: Cross multiply
   89,196.39x = 123,155.59 × 57,420.64
4. Step 4: Simplify right side
   89,196.39x = 7,071,672,797.38
5. Step 5: Solve for x
   x = 7,071,672,797.38/89,196.39
6. Step 6: Final answer
   x = 79,282.05