Finding the Fourth Proportional to 81,855.92, 122,682.84 and 42,390.32

Step by Step Solution

1. Step 1: Write the proportion equation
   81,855.92 : 122,682.84 = 42,390.32 : x
2. Step 2: Convert to fraction form
   81,855.92/122,682.84 = 42,390.32/x
3. Step 3: Cross multiply
   81,855.92x = 122,682.84 × 42,390.32
4. Step 4: Simplify right side
   81,855.92x = 5,200,564,846.11
5. Step 5: Solve for x
   x = 5,200,564,846.11/81,855.92
6. Step 6: Final answer
   x = 63,533.15