Finding the Fourth Proportional to 30,588.80, 42,167.86 and 21,620.48

Step by Step Solution

1. Step 1: Write the proportion equation
   30,588.80 : 42,167.86 = 21,620.48 : x
2. Step 2: Convert to fraction form
   30,588.80/42,167.86 = 21,620.48/x
3. Step 3: Cross multiply
   30,588.80x = 42,167.86 × 21,620.48
4. Step 4: Simplify right side
   30,588.80x = 911,689,108.88
5. Step 5: Solve for x
   x = 911,689,108.88/30,588.80
6. Step 6: Final answer
   x = 29,804.68