Finding the Fourth Proportional to 105,075.42, 145,057.59 and 81,148.38

Step by Step Solution

1. Step 1: Write the proportion equation
   105,075.42 : 145,057.59 = 81,148.38 : x
2. Step 2: Convert to fraction form
   105,075.42/145,057.59 = 81,148.38/x
3. Step 3: Cross multiply
   105,075.42x = 145,057.59 × 81,148.38
4. Step 4: Simplify right side
   105,075.42x = 11,771,188,435.20
5. Step 5: Solve for x
   x = 11,771,188,435.20/105,075.42
6. Step 6: Final answer
   x = 112,026.09