Finding the Fourth Proportional to 105,407.98, 145,364.43 and 83,969

Step by Step Solution

1. Step 1: Write the proportion equation
   105,407.98 : 145,364.43 = 83,969 : x
2. Step 2: Convert to fraction form
   105,407.98/145,364.43 = 83,969/x
3. Step 3: Cross multiply
   105,407.98x = 145,364.43 × 83,969
4. Step 4: Simplify right side
   105,407.98x = 12,206,105,822.67
5. Step 5: Solve for x
   x = 12,206,105,822.67/105,407.98
6. Step 6: Final answer
   x = 115,798.69