Finding the Fourth Proportional to 120,575.31, 180,900.61 and 72,596.51

Step by Step Solution

1. Step 1: Write the proportion equation
   120,575.31 : 180,900.61 = 72,596.51 : x
2. Step 2: Convert to fraction form
   120,575.31/180,900.61 = 72,596.51/x
3. Step 3: Cross multiply
   120,575.31x = 180,900.61 × 72,596.51
4. Step 4: Simplify right side
   120,575.31x = 13,132,752,761.38
5. Step 5: Solve for x
   x = 13,132,752,761.38/120,575.31
6. Step 6: Final answer
   x = 108,917.43