Finding the Fourth Proportional to 30,558.80, 42,092.24 and 21,590.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,558.80 : 42,092.24 = 21,590.72 : x
2. Step 2: Convert to fraction form
   30,558.80/42,092.24 = 21,590.72/x
3. Step 3: Cross multiply
   30,558.80x = 42,092.24 × 21,590.72
4. Step 4: Simplify right side
   30,558.80x = 908,801,768.01
5. Step 5: Solve for x
   x = 908,801,768.01/30,558.80
6. Step 6: Final answer
   x = 29,739.45