Finding the Fourth Proportional to 45,570, 68,357.56 and 12,740.56

Step by Step Solution

1. Step 1: Write the proportion equation
   45,570 : 68,357.56 = 12,740.56 : x
2. Step 2: Convert to fraction form
   45,570/68,357.56 = 12,740.56/x
3. Step 3: Cross multiply
   45,570x = 68,357.56 × 12,740.56
4. Step 4: Simplify right side
   45,570x = 870,913,594.63
5. Step 5: Solve for x
   x = 870,913,594.63/45,570
6. Step 6: Final answer
   x = 19,111.56