Finding the Fourth Proportional to 105,138, 145,103.81 and 69,402.42

Step by Step Solution

1. Step 1: Write the proportion equation
   105,138 : 145,103.81 = 69,402.42 : x
2. Step 2: Convert to fraction form
   105,138/145,103.81 = 69,402.42/x
3. Step 3: Cross multiply
   105,138x = 145,103.81 × 69,402.42
4. Step 4: Simplify right side
   105,138x = 10,070,555,218.21
5. Step 5: Solve for x
   x = 10,070,555,218.21/105,138
6. Step 6: Final answer
   x = 95,784.16