Finding the Fourth Proportional to 10,557.69, 15,840.35 and 4,940.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,557.69 : 15,840.35 = 4,940.31 : x
2. Step 2: Convert to fraction form
   10,557.69/15,840.35 = 4,940.31/x
3. Step 3: Cross multiply
   10,557.69x = 15,840.35 × 4,940.31
4. Step 4: Simplify right side
   10,557.69x = 78,256,239.51
5. Step 5: Solve for x
   x = 78,256,239.51/10,557.69
6. Step 6: Final answer
   x = 7,412.25