Finding the Fourth Proportional to 105,429.12, 157,968.18 and 74,198.76

Step by Step Solution

1. Step 1: Write the proportion equation
   105,429.12 : 157,968.18 = 74,198.76 : x
2. Step 2: Convert to fraction form
   105,429.12/157,968.18 = 74,198.76/x
3. Step 3: Cross multiply
   105,429.12x = 157,968.18 × 74,198.76
4. Step 4: Simplify right side
   105,429.12x = 11,721,043,075.46
5. Step 5: Solve for x
   x = 11,721,043,075.46/105,429.12
6. Step 6: Final answer
   x = 111,174.63