Finding the Fourth Proportional to 105,138.52, 145,091.28 and 67,412.76

Step by Step Solution

1. Step 1: Write the proportion equation
   105,138.52 : 145,091.28 = 67,412.76 : x
2. Step 2: Convert to fraction form
   105,138.52/145,091.28 = 67,412.76/x
3. Step 3: Cross multiply
   105,138.52x = 145,091.28 × 67,412.76
4. Step 4: Simplify right side
   105,138.52x = 9,781,003,636.73
5. Step 5: Solve for x
   x = 9,781,003,636.73/105,138.52
6. Step 6: Final answer
   x = 93,029.69