Finding the Fourth Proportional to 22,926.28, 31,643.90 and 13,978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,926.28 : 31,643.90 = 13,978.72 : x
2. Step 2: Convert to fraction form
   22,926.28/31,643.90 = 13,978.72/x
3. Step 3: Cross multiply
   22,926.28x = 31,643.90 × 13,978.72
4. Step 4: Simplify right side
   22,926.28x = 442,341,217.81
5. Step 5: Solve for x
   x = 442,341,217.81/22,926.28
6. Step 6: Final answer
   x = 19,294.07