Finding the Fourth Proportional to 120,642.72, 166,482.96 and 72,887.68

Step by Step Solution

1. Step 1: Write the proportion equation
   120,642.72 : 166,482.96 = 72,887.68 : x
2. Step 2: Convert to fraction form
   120,642.72/166,482.96 = 72,887.68/x
3. Step 3: Cross multiply
   120,642.72x = 166,482.96 × 72,887.68
4. Step 4: Simplify right side
   120,642.72x = 12,134,556,713.93
5. Step 5: Solve for x
   x = 12,134,556,713.93/120,642.72
6. Step 6: Final answer
   x = 100,582.59