Finding the Fourth Proportional to 22,356.72, 30,840.48 and 13,978.08

Step by Step Solution

1. Step 1: Write the proportion equation
   22,356.72 : 30,840.48 = 13,978.08 : x
2. Step 2: Convert to fraction form
   22,356.72/30,840.48 = 13,978.08/x
3. Step 3: Cross multiply
   22,356.72x = 30,840.48 × 13,978.08
4. Step 4: Simplify right side
   22,356.72x = 431,090,696.68
5. Step 5: Solve for x
   x = 431,090,696.68/22,356.72
6. Step 6: Final answer
   x = 19,282.38