Finding the Fourth Proportional to 105,111.36, 145,055.76 and 57,366.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,111.36 : 145,055.76 = 57,366.72 : x
2. Step 2: Convert to fraction form
   105,111.36/145,055.76 = 57,366.72/x
3. Step 3: Cross multiply
   105,111.36x = 145,055.76 × 57,366.72
4. Step 4: Simplify right side
   105,111.36x = 8,321,373,168.31
5. Step 5: Solve for x
   x = 8,321,373,168.31/105,111.36
6. Step 6: Final answer
   x = 79,167.21