Finding the Fourth Proportional to 81,059.94, 121,595.72 and 31,140.05

Step by Step Solution

1. Step 1: Write the proportion equation
   81,059.94 : 121,595.72 = 31,140.05 : x
2. Step 2: Convert to fraction form
   81,059.94/121,595.72 = 31,140.05/x
3. Step 3: Cross multiply
   81,059.94x = 121,595.72 × 31,140.05
4. Step 4: Simplify right side
   81,059.94x = 3,786,496,036.91
5. Step 5: Solve for x
   x = 3,786,496,036.91/81,059.94
6. Step 6: Final answer
   x = 46,712.30