Finding the Fourth Proportional to 105,479.47, 145,561.13 and 57,081.36

Step by Step Solution

1. Step 1: Write the proportion equation
   105,479.47 : 145,561.13 = 57,081.36 : x
2. Step 2: Convert to fraction form
   105,479.47/145,561.13 = 57,081.36/x
3. Step 3: Cross multiply
   105,479.47x = 145,561.13 × 57,081.36
4. Step 4: Simplify right side
   105,479.47x = 8,308,827,263.54
5. Step 5: Solve for x
   x = 8,308,827,263.54/105,479.47
6. Step 6: Final answer
   x = 78,771.99