Finding the Fourth Proportional to 89,434, 123,419.40 and 49,690

Step by Step Solution

1. Step 1: Write the proportion equation
   89,434 : 123,419.40 = 49,690 : x
2. Step 2: Convert to fraction form
   89,434/123,419.40 = 49,690/x
3. Step 3: Cross multiply
   89,434x = 123,419.40 × 49,690
4. Step 4: Simplify right side
   89,434x = 6,132,709,986
5. Step 5: Solve for x
   x = 6,132,709,986/89,434
6. Step 6: Final answer
   x = 68,572.47