Finding the Fourth Proportional to 105,659.06, 145,808.63 and 57,912.29

Step by Step Solution

1. Step 1: Write the proportion equation
   105,659.06 : 145,808.63 = 57,912.29 : x
2. Step 2: Convert to fraction form
   105,659.06/145,808.63 = 57,912.29/x
3. Step 3: Cross multiply
   105,659.06x = 145,808.63 × 57,912.29
4. Step 4: Simplify right side
   105,659.06x = 8,444,111,665.06
5. Step 5: Solve for x
   x = 8,444,111,665.06/105,659.06
6. Step 6: Final answer
   x = 79,918.48