Finding the Fourth Proportional to 105,260.71, 145,260.80 and 57,514.05

Step by Step Solution

1. Step 1: Write the proportion equation
   105,260.71 : 145,260.80 = 57,514.05 : x
2. Step 2: Convert to fraction form
   105,260.71/145,260.80 = 57,514.05/x
3. Step 3: Cross multiply
   105,260.71x = 145,260.80 × 57,514.05
4. Step 4: Simplify right side
   105,260.71x = 8,354,536,989.82
5. Step 5: Solve for x
   x = 8,354,536,989.82/105,260.71
6. Step 6: Final answer
   x = 79,369.95