Finding the Fourth Proportional to 172,406.88, 237,906.72 and 100,778.58

Step by Step Solution

1. Step 1: Write the proportion equation
   172,406.88 : 237,906.72 = 100,778.58 : x
2. Step 2: Convert to fraction form
   172,406.88/237,906.72 = 100,778.58/x
3. Step 3: Cross multiply
   172,406.88x = 237,906.72 × 100,778.58
4. Step 4: Simplify right side
   172,406.88x = 23,975,901,414.06
5. Step 5: Solve for x
   x = 23,975,901,414.06/172,406.88
6. Step 6: Final answer
   x = 139,065.80