Finding the Fourth Proportional to 105,659.98, 145,814.40 and 57,913.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,659.98 : 145,814.40 = 57,913.30 : x
2. Step 2: Convert to fraction form
   105,659.98/145,814.40 = 57,913.30/x
3. Step 3: Cross multiply
   105,659.98x = 145,814.40 × 57,913.30
4. Step 4: Simplify right side
   105,659.98x = 8,444,593,091.52
5. Step 5: Solve for x
   x = 8,444,593,091.52/105,659.98
6. Step 6: Final answer
   x = 79,922.34