Finding the Fourth Proportional to 105,271.70, 145,275.31 and 57,525.05

Step by Step Solution

1. Step 1: Write the proportion equation
   105,271.70 : 145,275.31 = 57,525.05 : x
2. Step 2: Convert to fraction form
   105,271.70/145,275.31 = 57,525.05/x
3. Step 3: Cross multiply
   105,271.70x = 145,275.31 × 57,525.05
4. Step 4: Simplify right side
   105,271.70x = 8,356,969,471.52
5. Step 5: Solve for x
   x = 8,356,969,471.52/105,271.70
6. Step 6: Final answer
   x = 79,384.77