Finding the Fourth Proportional to 105,900.71, 145,940.91 and 103,955.15

Step by Step Solution

1. Step 1: Write the proportion equation
   105,900.71 : 145,940.91 = 103,955.15 : x
2. Step 2: Convert to fraction form
   105,900.71/145,940.91 = 103,955.15/x
3. Step 3: Cross multiply
   105,900.71x = 145,940.91 × 103,955.15
4. Step 4: Simplify right side
   105,900.71x = 15,171,308,460.48
5. Step 5: Solve for x
   x = 15,171,308,460.48/105,900.71
6. Step 6: Final answer
   x = 143,259.75