Finding the Fourth Proportional to 105,380.60, 145,417.28 and 57,632.31

Step by Step Solution

1. Step 1: Write the proportion equation
   105,380.60 : 145,417.28 = 57,632.31 : x
2. Step 2: Convert to fraction form
   105,380.60/145,417.28 = 57,632.31/x
3. Step 3: Cross multiply
   105,380.60x = 145,417.28 × 57,632.31
4. Step 4: Simplify right side
   105,380.60x = 8,380,733,472.16
5. Step 5: Solve for x
   x = 8,380,733,472.16/105,380.60
6. Step 6: Final answer
   x = 79,528.24