Finding the Fourth Proportional to 171,730, 236,906.76 and 121,456.72

Step by Step Solution

1. Step 1: Write the proportion equation
   171,730 : 236,906.76 = 121,456.72 : x
2. Step 2: Convert to fraction form
   171,730/236,906.76 = 121,456.72/x
3. Step 3: Cross multiply
   171,730x = 236,906.76 × 121,456.72
4. Step 4: Simplify right side
   171,730x = 28,773,918,015.43
5. Step 5: Solve for x
   x = 28,773,918,015.43/171,730
6. Step 6: Final answer
   x = 167,553.24