Finding the Fourth Proportional to 105,105.32, 145,044.12 and 57,359.48

Step by Step Solution

1. Step 1: Write the proportion equation
   105,105.32 : 145,044.12 = 57,359.48 : x
2. Step 2: Convert to fraction form
   105,105.32/145,044.12 = 57,359.48/x
3. Step 3: Cross multiply
   105,105.32x = 145,044.12 × 57,359.48
4. Step 4: Simplify right side
   105,105.32x = 8,319,655,300.26
5. Step 5: Solve for x
   x = 8,319,655,300.26/105,105.32
6. Step 6: Final answer
   x = 79,155.42