Finding the Fourth Proportional to 105,577.80, 145,697.88 and 57,831

Step by Step Solution

1. Step 1: Write the proportion equation
   105,577.80 : 145,697.88 = 57,831 : x
2. Step 2: Convert to fraction form
   105,577.80/145,697.88 = 57,831/x
3. Step 3: Cross multiply
   105,577.80x = 145,697.88 × 57,831
4. Step 4: Simplify right side
   105,577.80x = 8,425,854,098.28
5. Step 5: Solve for x
   x = 8,425,854,098.28/105,577.80
6. Step 6: Final answer
   x = 79,807.06