Finding the Fourth Proportional to 231,689.72, 319,636.78 and 140,972.96

Step by Step Solution

1. Step 1: Write the proportion equation
   231,689.72 : 319,636.78 = 140,972.96 : x
2. Step 2: Convert to fraction form
   231,689.72/319,636.78 = 140,972.96/x
3. Step 3: Cross multiply
   231,689.72x = 319,636.78 × 140,972.96
4. Step 4: Simplify right side
   231,689.72x = 45,060,143,001.47
5. Step 5: Solve for x
   x = 45,060,143,001.47/231,689.72
6. Step 6: Final answer
   x = 194,484.86