Finding the Fourth Proportional to 22,390.65, 30,878.12 and 13,894.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,390.65 : 30,878.12 = 13,894.15 : x
2. Step 2: Convert to fraction form
   22,390.65/30,878.12 = 13,894.15/x
3. Step 3: Cross multiply
   22,390.65x = 30,878.12 × 13,894.15
4. Step 4: Simplify right side
   22,390.65x = 429,025,231.00
5. Step 5: Solve for x
   x = 429,025,231.00/22,390.65
6. Step 6: Final answer
   x = 19,160.91