Finding the Fourth Proportional to 105,426.97, 145,549.37 and 69,720.55

Step by Step Solution

1. Step 1: Write the proportion equation
   105,426.97 : 145,549.37 = 69,720.55 : x
2. Step 2: Convert to fraction form
   105,426.97/145,549.37 = 69,720.55/x
3. Step 3: Cross multiply
   105,426.97x = 145,549.37 × 69,720.55
4. Step 4: Simplify right side
   105,426.97x = 10,147,782,128.55
5. Step 5: Solve for x
   x = 10,147,782,128.55/105,426.97
6. Step 6: Final answer
   x = 96,254.14