Finding the Fourth Proportional to 105,454.50, 145,522.54 and 57,709.86

Step by Step Solution

1. Step 1: Write the proportion equation
   105,454.50 : 145,522.54 = 57,709.86 : x
2. Step 2: Convert to fraction form
   105,454.50/145,522.54 = 57,709.86/x
3. Step 3: Cross multiply
   105,454.50x = 145,522.54 × 57,709.86
4. Step 4: Simplify right side
   105,454.50x = 8,398,085,410.24
5. Step 5: Solve for x
   x = 8,398,085,410.24/105,454.50
6. Step 6: Final answer
   x = 79,637.05