Finding the Fourth Proportional to 12,705.78, 17,533.71 and 7,040.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,705.78 : 17,533.71 = 7,040.48 : x
2. Step 2: Convert to fraction form
   12,705.78/17,533.71 = 7,040.48/x
3. Step 3: Cross multiply
   12,705.78x = 17,533.71 × 7,040.48
4. Step 4: Simplify right side
   12,705.78x = 123,445,664.51
5. Step 5: Solve for x
   x = 123,445,664.51/12,705.78
6. Step 6: Final answer
   x = 9,715.71