Finding the Fourth Proportional to 171,951.28, 258,196.56 and 145,642.12

Step by Step Solution

1. Step 1: Write the proportion equation
   171,951.28 : 258,196.56 = 145,642.12 : x
2. Step 2: Convert to fraction form
   171,951.28/258,196.56 = 145,642.12/x
3. Step 3: Cross multiply
   171,951.28x = 258,196.56 × 145,642.12
4. Step 4: Simplify right side
   171,951.28x = 37,604,294,375.11
5. Step 5: Solve for x
   x = 37,604,294,375.11/171,951.28
6. Step 6: Final answer
   x = 218,691.56