Finding the Fourth Proportional to 89,406, 133,904.88 and 42,691.68

Step by Step Solution

1. Step 1: Write the proportion equation
   89,406 : 133,904.88 = 42,691.68 : x
2. Step 2: Convert to fraction form
   89,406/133,904.88 = 42,691.68/x
3. Step 3: Cross multiply
   89,406x = 133,904.88 × 42,691.68
4. Step 4: Simplify right side
   89,406x = 5,716,624,287.40
5. Step 5: Solve for x
   x = 5,716,624,287.40/89,406
6. Step 6: Final answer
   x = 63,940.05