Finding the Fourth Proportional to 89,443.31, 123,404.81 and 53,620.25

Step by Step Solution

1. Step 1: Write the proportion equation
   89,443.31 : 123,404.81 = 53,620.25 : x
2. Step 2: Convert to fraction form
   89,443.31/123,404.81 = 53,620.25/x
3. Step 3: Cross multiply
   89,443.31x = 123,404.81 × 53,620.25
4. Step 4: Simplify right side
   89,443.31x = 6,616,995,878.28
5. Step 5: Solve for x
   x = 6,616,995,878.28/89,443.31
6. Step 6: Final answer
   x = 73,979.78