Finding the Fourth Proportional to 171,086.15, 236,128.19 and 99,507.69

Step by Step Solution

1. Step 1: Write the proportion equation
   171,086.15 : 236,128.19 = 99,507.69 : x
2. Step 2: Convert to fraction form
   171,086.15/236,128.19 = 99,507.69/x
3. Step 3: Cross multiply
   171,086.15x = 236,128.19 × 99,507.69
4. Step 4: Simplify right side
   171,086.15x = 23,496,570,233.24
5. Step 5: Solve for x
   x = 23,496,570,233.24/171,086.15
6. Step 6: Final answer
   x = 137,337.65