Finding the Fourth Proportional to 231,429.12, 347,171.04 and 81,638.16

Step by Step Solution

1. Step 1: Write the proportion equation
   231,429.12 : 347,171.04 = 81,638.16 : x
2. Step 2: Convert to fraction form
   231,429.12/347,171.04 = 81,638.16/x
3. Step 3: Cross multiply
   231,429.12x = 347,171.04 × 81,638.16
4. Step 4: Simplify right side
   231,429.12x = 28,342,404,910.89
5. Step 5: Solve for x
   x = 28,342,404,910.89/231,429.12
6. Step 6: Final answer
   x = 122,466.89