Finding the Fourth Proportional to 105,411.89, 145,467.95 and 57,013.88

Step by Step Solution

1. Step 1: Write the proportion equation
   105,411.89 : 145,467.95 = 57,013.88 : x
2. Step 2: Convert to fraction form
   105,411.89/145,467.95 = 57,013.88/x
3. Step 3: Cross multiply
   105,411.89x = 145,467.95 × 57,013.88
4. Step 4: Simplify right side
   105,411.89x = 8,293,692,245.15
5. Step 5: Solve for x
   x = 8,293,692,245.15/105,411.89
6. Step 6: Final answer
   x = 78,678.91