Finding the Fourth Proportional to 105,131.75, 145,081.95 and 67,406

Step by Step Solution

1. Step 1: Write the proportion equation
   105,131.75 : 145,081.95 = 67,406 : x
2. Step 2: Convert to fraction form
   105,131.75/145,081.95 = 67,406/x
3. Step 3: Cross multiply
   105,131.75x = 145,081.95 × 67,406
4. Step 4: Simplify right side
   105,131.75x = 9,779,393,921.70
5. Step 5: Solve for x
   x = 9,779,393,921.70/105,131.75
6. Step 6: Final answer
   x = 93,020.37