Finding the Fourth Proportional to 105,056.83, 144,978.12 and 57,309.83

Step by Step Solution

1. Step 1: Write the proportion equation
   105,056.83 : 144,978.12 = 57,309.83 : x
2. Step 2: Convert to fraction form
   105,056.83/144,978.12 = 57,309.83/x
3. Step 3: Cross multiply
   105,056.83x = 144,978.12 × 57,309.83
4. Step 4: Simplify right side
   105,056.83x = 8,308,672,045.20
5. Step 5: Solve for x
   x = 8,308,672,045.20/105,056.83
6. Step 6: Final answer
   x = 79,087.41