Finding the Fourth Proportional to 105,134.25, 145,085.40 and 67,408.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,134.25 : 145,085.40 = 67,408.50 : x
2. Step 2: Convert to fraction form
   105,134.25/145,085.40 = 67,408.50/x
3. Step 3: Cross multiply
   105,134.25x = 145,085.40 × 67,408.50
4. Step 4: Simplify right side
   105,134.25x = 9,779,989,185.90
5. Step 5: Solve for x
   x = 9,779,989,185.90/105,134.25
6. Step 6: Final answer
   x = 93,023.82