Finding the Fourth Proportional to 105,055.64, 144,978.84 and 57,310.76

Step by Step Solution

1. Step 1: Write the proportion equation
   105,055.64 : 144,978.84 = 57,310.76 : x
2. Step 2: Convert to fraction form
   105,055.64/144,978.84 = 57,310.76/x
3. Step 3: Cross multiply
   105,055.64x = 144,978.84 × 57,310.76
4. Step 4: Simplify right side
   105,055.64x = 8,308,847,504.32
5. Step 5: Solve for x
   x = 8,308,847,504.32/105,055.64
6. Step 6: Final answer
   x = 79,089.97