Finding the Fourth Proportional to 28,053.16, 42,051.30 and 18,198.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,053.16 : 42,051.30 = 18,198.72 : x
2. Step 2: Convert to fraction form
   28,053.16/42,051.30 = 18,198.72/x
3. Step 3: Cross multiply
   28,053.16x = 42,051.30 × 18,198.72
4. Step 4: Simplify right side
   28,053.16x = 765,279,834.34
5. Step 5: Solve for x
   x = 765,279,834.34/28,053.16
6. Step 6: Final answer
   x = 27,279.63