Finding the Fourth Proportional to 20,667.63, 28,470.71 and 14,985.68

Step by Step Solution

1. Step 1: Write the proportion equation
   20,667.63 : 28,470.71 = 14,985.68 : x
2. Step 2: Convert to fraction form
   20,667.63/28,470.71 = 14,985.68/x
3. Step 3: Cross multiply
   20,667.63x = 28,470.71 × 14,985.68
4. Step 4: Simplify right side
   20,667.63x = 426,653,058.07
5. Step 5: Solve for x
   x = 426,653,058.07/20,667.63
6. Step 6: Final answer
   x = 20,643.54