Finding the Fourth Proportional to 105,447.95, 145,518.18 and 57,701.31

Step by Step Solution

1. Step 1: Write the proportion equation
   105,447.95 : 145,518.18 = 57,701.31 : x
2. Step 2: Convert to fraction form
   105,447.95/145,518.18 = 57,701.31/x
3. Step 3: Cross multiply
   105,447.95x = 145,518.18 × 57,701.31
4. Step 4: Simplify right side
   105,447.95x = 8,396,588,598.72
5. Step 5: Solve for x
   x = 8,396,588,598.72/105,447.95
6. Step 6: Final answer
   x = 79,627.81