Finding the Fourth Proportional to 120,036.89, 165,510.41 and 81,819.07

Step by Step Solution

1. Step 1: Write the proportion equation
   120,036.89 : 165,510.41 = 81,819.07 : x
2. Step 2: Convert to fraction form
   120,036.89/165,510.41 = 81,819.07/x
3. Step 3: Cross multiply
   120,036.89x = 165,510.41 × 81,819.07
4. Step 4: Simplify right side
   120,036.89x = 13,541,906,998.65
5. Step 5: Solve for x
   x = 13,541,906,998.65/120,036.89
6. Step 6: Final answer
   x = 112,814.54