Finding the Fourth Proportional to 121,077.72, 181,609.20 and 57,942.72

Step by Step Solution

1. Step 1: Write the proportion equation
   121,077.72 : 181,609.20 = 57,942.72 : x
2. Step 2: Convert to fraction form
   121,077.72/181,609.20 = 57,942.72/x
3. Step 3: Cross multiply
   121,077.72x = 181,609.20 × 57,942.72
4. Step 4: Simplify right side
   121,077.72x = 10,522,931,025.02
5. Step 5: Solve for x
   x = 10,522,931,025.02/121,077.72
6. Step 6: Final answer
   x = 86,910.55