Finding the Fourth Proportional to 105,480.98, 145,562.51 and 57,081.78

Step by Step Solution

1. Step 1: Write the proportion equation
   105,480.98 : 145,562.51 = 57,081.78 : x
2. Step 2: Convert to fraction form
   105,480.98/145,562.51 = 57,081.78/x
3. Step 3: Cross multiply
   105,480.98x = 145,562.51 × 57,081.78
4. Step 4: Simplify right side
   105,480.98x = 8,308,967,314.77
5. Step 5: Solve for x
   x = 8,308,967,314.77/105,480.98
6. Step 6: Final answer
   x = 78,772.19