Finding the Fourth Proportional to 105,393.56, 145,440.09 and 57,645.86

Step by Step Solution

1. Step 1: Write the proportion equation
   105,393.56 : 145,440.09 = 57,645.86 : x
2. Step 2: Convert to fraction form
   105,393.56/145,440.09 = 57,645.86/x
3. Step 3: Cross multiply
   105,393.56x = 145,440.09 × 57,645.86
4. Step 4: Simplify right side
   105,393.56x = 8,384,018,339.33
5. Step 5: Solve for x
   x = 8,384,018,339.33/105,393.56
6. Step 6: Final answer
   x = 79,549.63