Finding the Fourth Proportional to 89,628.39, 123,789.54 and 60,900.05

Step by Step Solution

1. Step 1: Write the proportion equation
   89,628.39 : 123,789.54 = 60,900.05 : x
2. Step 2: Convert to fraction form
   89,628.39/123,789.54 = 60,900.05/x
3. Step 3: Cross multiply
   89,628.39x = 123,789.54 × 60,900.05
4. Step 4: Simplify right side
   89,628.39x = 7,538,788,858.18
5. Step 5: Solve for x
   x = 7,538,788,858.18/89,628.39
6. Step 6: Final answer
   x = 84,111.62