Finding the Fourth Proportional to 112,911.56, 155,806.72 and 65,180.28

Step by Step Solution

1. Step 1: Write the proportion equation
   112,911.56 : 155,806.72 = 65,180.28 : x
2. Step 2: Convert to fraction form
   112,911.56/155,806.72 = 65,180.28/x
3. Step 3: Cross multiply
   112,911.56x = 155,806.72 × 65,180.28
4. Step 4: Simplify right side
   112,911.56x = 10,155,525,309.58
5. Step 5: Solve for x
   x = 10,155,525,309.58/112,911.56
6. Step 6: Final answer
   x = 89,942.30