Finding the Fourth Proportional to 105,411.84, 145,574.59 and 67,189.40

Step by Step Solution

1. Step 1: Write the proportion equation
   105,411.84 : 145,574.59 = 67,189.40 : x
2. Step 2: Convert to fraction form
   105,411.84/145,574.59 = 67,189.40/x
3. Step 3: Cross multiply
   105,411.84x = 145,574.59 × 67,189.40
4. Step 4: Simplify right side
   105,411.84x = 9,781,069,357.35
5. Step 5: Solve for x
   x = 9,781,069,357.35/105,411.84
6. Step 6: Final answer
   x = 92,789.10