Finding the Fourth Proportional to 172,299.81, 237,738.89 and 100,665.99

Step by Step Solution

1. Step 1: Write the proportion equation
   172,299.81 : 237,738.89 = 100,665.99 : x
2. Step 2: Convert to fraction form
   172,299.81/237,738.89 = 100,665.99/x
3. Step 3: Cross multiply
   172,299.81x = 237,738.89 × 100,665.99
4. Step 4: Simplify right side
   172,299.81x = 23,932,219,877.34
5. Step 5: Solve for x
   x = 23,932,219,877.34/172,299.81
6. Step 6: Final answer
   x = 138,898.71