Finding the Fourth Proportional to 231,653.34, 319,681.72 and 129,679

Step by Step Solution

1. Step 1: Write the proportion equation
   231,653.34 : 319,681.72 = 129,679 : x
2. Step 2: Convert to fraction form
   231,653.34/319,681.72 = 129,679/x
3. Step 3: Cross multiply
   231,653.34x = 319,681.72 × 129,679
4. Step 4: Simplify right side
   231,653.34x = 41,456,005,767.88
5. Step 5: Solve for x
   x = 41,456,005,767.88/231,653.34
6. Step 6: Final answer
   x = 178,957.08