Finding the Fourth Proportional to 318,081.69, 477,111.60 and 81,426.42

Step by Step Solution

1. Step 1: Write the proportion equation
   318,081.69 : 477,111.60 = 81,426.42 : x
2. Step 2: Convert to fraction form
   318,081.69/477,111.60 = 81,426.42/x
3. Step 3: Cross multiply
   318,081.69x = 477,111.60 × 81,426.42
4. Step 4: Simplify right side
   318,081.69x = 38,849,489,528.47
5. Step 5: Solve for x
   x = 38,849,489,528.47/318,081.69
6. Step 6: Final answer
   x = 122,136.83