Finding the Fourth Proportional to 231,688.72, 319,635.40 and 140,971.96

Step by Step Solution

1. Step 1: Write the proportion equation
   231,688.72 : 319,635.40 = 140,971.96 : x
2. Step 2: Convert to fraction form
   231,688.72/319,635.40 = 140,971.96/x
3. Step 3: Cross multiply
   231,688.72x = 319,635.40 × 140,971.96
4. Step 4: Simplify right side
   231,688.72x = 45,059,628,823.38
5. Step 5: Solve for x
   x = 45,059,628,823.38/231,688.72
6. Step 6: Final answer
   x = 194,483.48