Finding the Fourth Proportional to 120,814.71, 166,718.90 and 72,443.33

Step by Step Solution

1. Step 1: Write the proportion equation
   120,814.71 : 166,718.90 = 72,443.33 : x
2. Step 2: Convert to fraction form
   120,814.71/166,718.90 = 72,443.33/x
3. Step 3: Cross multiply
   120,814.71x = 166,718.90 × 72,443.33
4. Step 4: Simplify right side
   120,814.71x = 12,077,672,289.94
5. Step 5: Solve for x
   x = 12,077,672,289.94/120,814.71
6. Step 6: Final answer
   x = 99,968.56