Finding the Fourth Proportional to 105,138, 145,090.62 and 67,412.25

Step by Step Solution

1. Step 1: Write the proportion equation
   105,138 : 145,090.62 = 67,412.25 : x
2. Step 2: Convert to fraction form
   105,138/145,090.62 = 67,412.25/x
3. Step 3: Cross multiply
   105,138x = 145,090.62 × 67,412.25
4. Step 4: Simplify right side
   105,138x = 9,780,885,148.10
5. Step 5: Solve for x
   x = 9,780,885,148.10/105,138
6. Step 6: Final answer
   x = 93,029.02