Finding the Fourth Proportional to 20,630.72, 28,460.04 and 13,907.84

Step by Step Solution

1. Step 1: Write the proportion equation
   20,630.72 : 28,460.04 = 13,907.84 : x
2. Step 2: Convert to fraction form
   20,630.72/28,460.04 = 13,907.84/x
3. Step 3: Cross multiply
   20,630.72x = 28,460.04 × 13,907.84
4. Step 4: Simplify right side
   20,630.72x = 395,817,682.71
5. Step 5: Solve for x
   x = 395,817,682.71/20,630.72
6. Step 6: Final answer
   x = 19,185.84