Finding the Fourth Proportional to 105,419.44, 145,477.59 and 57,672.22

Step by Step Solution

1. Step 1: Write the proportion equation
   105,419.44 : 145,477.59 = 57,672.22 : x
2. Step 2: Convert to fraction form
   105,419.44/145,477.59 = 57,672.22/x
3. Step 3: Cross multiply
   105,419.44x = 145,477.59 × 57,672.22
4. Step 4: Simplify right side
   105,419.44x = 8,390,015,575.55
5. Step 5: Solve for x
   x = 8,390,015,575.55/105,419.44
6. Step 6: Final answer
   x = 79,586.99