Finding the Fourth Proportional to 30,828.79, 42,543.72 and 16,681.63

Step by Step Solution

1. Step 1: Write the proportion equation
   30,828.79 : 42,543.72 = 16,681.63 : x
2. Step 2: Convert to fraction form
   30,828.79/42,543.72 = 16,681.63/x
3. Step 3: Cross multiply
   30,828.79x = 42,543.72 × 16,681.63
4. Step 4: Simplify right side
   30,828.79x = 709,698,595.86
5. Step 5: Solve for x
   x = 709,698,595.86/30,828.79
6. Step 6: Final answer
   x = 23,020.64