Finding the Fourth Proportional to 105,429.12, 145,487.52 and 57,684.48

Step by Step Solution

1. Step 1: Write the proportion equation
   105,429.12 : 145,487.52 = 57,684.48 : x
2. Step 2: Convert to fraction form
   105,429.12/145,487.52 = 57,684.48/x
3. Step 3: Cross multiply
   105,429.12x = 145,487.52 × 57,684.48
4. Step 4: Simplify right side
   105,429.12x = 8,392,371,937.69
5. Step 5: Solve for x
   x = 8,392,371,937.69/105,429.12
6. Step 6: Final answer
   x = 79,602.03