Finding the Fourth Proportional to 105,089.80, 145,022.71 and 57,343.94

Step by Step Solution

1. Step 1: Write the proportion equation
   105,089.80 : 145,022.71 = 57,343.94 : x
2. Step 2: Convert to fraction form
   105,089.80/145,022.71 = 57,343.94/x
3. Step 3: Cross multiply
   105,089.80x = 145,022.71 × 57,343.94
4. Step 4: Simplify right side
   105,089.80x = 8,316,173,294.16
5. Step 5: Solve for x
   x = 8,316,173,294.16/105,089.80
6. Step 6: Final answer
   x = 79,133.98