Finding the Fourth Proportional to 105,302.73, 145,312.72 and 57,556.10

Step by Step Solution

1. Step 1: Write the proportion equation
   105,302.73 : 145,312.72 = 57,556.10 : x
2. Step 2: Convert to fraction form
   105,302.73/145,312.72 = 57,556.10/x
3. Step 3: Cross multiply
   105,302.73x = 145,312.72 × 57,556.10
4. Step 4: Simplify right side
   105,302.73x = 8,363,633,662.98
5. Step 5: Solve for x
   x = 8,363,633,662.98/105,302.73
6. Step 6: Final answer
   x = 79,424.66