Finding the Fourth Proportional to 81,448.10, 122,168.10 and 42,009.20

Step by Step Solution

1. Step 1: Write the proportion equation
   81,448.10 : 122,168.10 = 42,009.20 : x
2. Step 2: Convert to fraction form
   81,448.10/122,168.10 = 42,009.20/x
3. Step 3: Cross multiply
   81,448.10x = 122,168.10 × 42,009.20
4. Step 4: Simplify right side
   81,448.10x = 5,132,184,146.52
5. Step 5: Solve for x
   x = 5,132,184,146.52/81,448.10
6. Step 6: Final answer
   x = 63,011.71