Finding the Fourth Proportional to 105,251.31, 145,242.54 and 57,506.31

Step by Step Solution

1. Step 1: Write the proportion equation
   105,251.31 : 145,242.54 = 57,506.31 : x
2. Step 2: Convert to fraction form
   105,251.31/145,242.54 = 57,506.31/x
3. Step 3: Cross multiply
   105,251.31x = 145,242.54 × 57,506.31
4. Step 4: Simplify right side
   105,251.31x = 8,352,362,530.43
5. Step 5: Solve for x
   x = 8,352,362,530.43/105,251.31
6. Step 6: Final answer
   x = 79,356.38