Finding the Fourth Proportional to 28,218.96, 42,493.34 and 20,875.22

Step by Step Solution

1. Step 1: Write the proportion equation
   28,218.96 : 42,493.34 = 20,875.22 : x
2. Step 2: Convert to fraction form
   28,218.96/42,493.34 = 20,875.22/x
3. Step 3: Cross multiply
   28,218.96x = 42,493.34 × 20,875.22
4. Step 4: Simplify right side
   28,218.96x = 887,057,821.03
5. Step 5: Solve for x
   x = 887,057,821.03/28,218.96
6. Step 6: Final answer
   x = 31,434.82