Finding the Fourth Proportional to 105,287.18, 145,295.98 and 57,540.53

Step by Step Solution

1. Step 1: Write the proportion equation
   105,287.18 : 145,295.98 = 57,540.53 : x
2. Step 2: Convert to fraction form
   105,287.18/145,295.98 = 57,540.53/x
3. Step 3: Cross multiply
   105,287.18x = 145,295.98 × 57,540.53
4. Step 4: Simplify right side
   105,287.18x = 8,360,406,969.59
5. Step 5: Solve for x
   x = 8,360,406,969.59/105,287.18
6. Step 6: Final answer
   x = 79,405.75