Finding the Fourth Proportional to 105,060.09, 144,980.49 and 57,315.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,060.09 : 144,980.49 = 57,315.12 : x
2. Step 2: Convert to fraction form
   105,060.09/144,980.49 = 57,315.12/x
3. Step 3: Cross multiply
   105,060.09x = 144,980.49 × 57,315.12
4. Step 4: Simplify right side
   105,060.09x = 8,309,574,182.01
5. Step 5: Solve for x
   x = 8,309,574,182.01/105,060.09
6. Step 6: Final answer
   x = 79,093.54