Finding the Fourth Proportional to 89,233.34, 123,139.78 and 50,990.45

Step by Step Solution

1. Step 1: Write the proportion equation
   89,233.34 : 123,139.78 = 50,990.45 : x
2. Step 2: Convert to fraction form
   89,233.34/123,139.78 = 50,990.45/x
3. Step 3: Cross multiply
   89,233.34x = 123,139.78 × 50,990.45
4. Step 4: Simplify right side
   89,233.34x = 6,278,952,795.10
5. Step 5: Solve for x
   x = 6,278,952,795.10/89,233.34
6. Step 6: Final answer
   x = 70,365.55