Finding the Fourth Proportional to 124,609.45, 172,002.06 and 99,162.49

Step by Step Solution

1. Step 1: Write the proportion equation
   124,609.45 : 172,002.06 = 99,162.49 : x
2. Step 2: Convert to fraction form
   124,609.45/172,002.06 = 99,162.49/x
3. Step 3: Cross multiply
   124,609.45x = 172,002.06 × 99,162.49
4. Step 4: Simplify right side
   124,609.45x = 17,056,152,554.73
5. Step 5: Solve for x
   x = 17,056,152,554.73/124,609.45
6. Step 6: Final answer
   x = 136,876.88