Finding the Fourth Proportional to 105,681.45, 145,845.99 and 57,936.81

Step by Step Solution

1. Step 1: Write the proportion equation
   105,681.45 : 145,845.99 = 57,936.81 : x
2. Step 2: Convert to fraction form
   105,681.45/145,845.99 = 57,936.81/x
3. Step 3: Cross multiply
   105,681.45x = 145,845.99 × 57,936.81
4. Step 4: Simplify right side
   105,681.45x = 8,449,851,411.89
5. Step 5: Solve for x
   x = 8,449,851,411.89/105,681.45
6. Step 6: Final answer
   x = 79,955.86