Finding the Fourth Proportional to 105,575.76, 145,694.58 and 57,830.83

Step by Step Solution

1. Step 1: Write the proportion equation
   105,575.76 : 145,694.58 = 57,830.83 : x
2. Step 2: Convert to fraction form
   105,575.76/145,694.58 = 57,830.83/x
3. Step 3: Cross multiply
   105,575.76x = 145,694.58 × 57,830.83
4. Step 4: Simplify right side
   105,575.76x = 8,425,637,759.43
5. Step 5: Solve for x
   x = 8,425,637,759.43/105,575.76
6. Step 6: Final answer
   x = 79,806.56