Finding the Fourth Proportional to 105,131.25, 145,081.26 and 67,405.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,131.25 : 145,081.26 = 67,405.50 : x
2. Step 2: Convert to fraction form
   105,131.25/145,081.26 = 67,405.50/x
3. Step 3: Cross multiply
   105,131.25x = 145,081.26 × 67,405.50
4. Step 4: Simplify right side
   105,131.25x = 9,779,274,870.93
5. Step 5: Solve for x
   x = 9,779,274,870.93/105,131.25
6. Step 6: Final answer
   x = 93,019.68