Finding the Fourth Proportional to 121,259.98, 181,942.89 and 42,430.78

Step by Step Solution

1. Step 1: Write the proportion equation
   121,259.98 : 181,942.89 = 42,430.78 : x
2. Step 2: Convert to fraction form
   121,259.98/181,942.89 = 42,430.78/x
3. Step 3: Cross multiply
   121,259.98x = 181,942.89 × 42,430.78
4. Step 4: Simplify right side
   121,259.98x = 7,719,978,738.15
5. Step 5: Solve for x
   x = 7,719,978,738.15/121,259.98
6. Step 6: Final answer
   x = 63,664.69