Finding the Fourth Proportional to 105,451.98, 145,523.74 and 57,705.33

Step by Step Solution

1. Step 1: Write the proportion equation
   105,451.98 : 145,523.74 = 57,705.33 : x
2. Step 2: Convert to fraction form
   105,451.98/145,523.74 = 57,705.33/x
3. Step 3: Cross multiply
   105,451.98x = 145,523.74 × 57,705.33
4. Step 4: Simplify right side
   105,451.98x = 8,397,495,130.61
5. Step 5: Solve for x
   x = 8,397,495,130.61/105,451.98
6. Step 6: Final answer
   x = 79,633.36