Finding the Fourth Proportional to 121,257.98, 181,939.89 and 42,428.78

Step by Step Solution

1. Step 1: Write the proportion equation
   121,257.98 : 181,939.89 = 42,428.78 : x
2. Step 2: Convert to fraction form
   121,257.98/181,939.89 = 42,428.78/x
3. Step 3: Cross multiply
   121,257.98x = 181,939.89 × 42,428.78
4. Step 4: Simplify right side
   121,257.98x = 7,719,487,566.03
5. Step 5: Solve for x
   x = 7,719,487,566.03/121,257.98
6. Step 6: Final answer
   x = 63,661.69