Finding the Fourth Proportional to 105,148.94, 145,105.77 and 57,402.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,148.94 : 145,105.77 = 57,402.30 : x
2. Step 2: Convert to fraction form
   105,148.94/145,105.77 = 57,402.30/x
3. Step 3: Cross multiply
   105,148.94x = 145,105.77 × 57,402.30
4. Step 4: Simplify right side
   105,148.94x = 8,329,404,941.27
5. Step 5: Solve for x
   x = 8,329,404,941.27/105,148.94
6. Step 6: Final answer
   x = 79,215.30