Finding the Fourth Proportional to 89,424, 123,405.12 and 49,680

Step by Step Solution

1. Step 1: Write the proportion equation
   89,424 : 123,405.12 = 49,680 : x
2. Step 2: Convert to fraction form
   89,424/123,405.12 = 49,680/x
3. Step 3: Cross multiply
   89,424x = 123,405.12 × 49,680
4. Step 4: Simplify right side
   89,424x = 6,130,766,361.60
5. Step 5: Solve for x
   x = 6,130,766,361.60/89,424
6. Step 6: Final answer
   x = 68,558.40