Finding the Fourth Proportional to 39,558.59, 54,590.91 and 21,654.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,558.59 : 54,590.91 = 21,654.72 : x
2. Step 2: Convert to fraction form
   39,558.59/54,590.91 = 21,654.72/x
3. Step 3: Cross multiply
   39,558.59x = 54,590.91 × 21,654.72
4. Step 4: Simplify right side
   39,558.59x = 1,182,150,870.60
5. Step 5: Solve for x
   x = 1,182,150,870.60/39,558.59
6. Step 6: Final answer
   x = 29,883.55