Finding the Fourth Proportional to 112,912.06, 155,807.41 and 65,180.78

Step by Step Solution

1. Step 1: Write the proportion equation
   112,912.06 : 155,807.41 = 65,180.78 : x
2. Step 2: Convert to fraction form
   112,912.06/155,807.41 = 65,180.78/x
3. Step 3: Cross multiply
   112,912.06x = 155,807.41 × 65,180.78
4. Step 4: Simplify right side
   112,912.06x = 10,155,648,513.58
5. Step 5: Solve for x
   x = 10,155,648,513.58/112,912.06
6. Step 6: Final answer
   x = 89,942.99