Finding the Fourth Proportional to 10,131.78, 13,980.15 and 5,655.36

Step by Step Solution

1. Step 1: Write the proportion equation
   10,131.78 : 13,980.15 = 5,655.36 : x
2. Step 2: Convert to fraction form
   10,131.78/13,980.15 = 5,655.36/x
3. Step 3: Cross multiply
   10,131.78x = 13,980.15 × 5,655.36
4. Step 4: Simplify right side
   10,131.78x = 79,062,781.10
5. Step 5: Solve for x
   x = 79,062,781.10/10,131.78
6. Step 6: Final answer
   x = 7,803.44