Finding the Fourth Proportional to 28,085.10, 42,139.80 and 14,234.10

Step by Step Solution

1. Step 1: Write the proportion equation
   28,085.10 : 42,139.80 = 14,234.10 : x
2. Step 2: Convert to fraction form
   28,085.10/42,139.80 = 14,234.10/x
3. Step 3: Cross multiply
   28,085.10x = 42,139.80 × 14,234.10
4. Step 4: Simplify right side
   28,085.10x = 599,822,127.18
5. Step 5: Solve for x
   x = 599,822,127.18/28,085.10
6. Step 6: Final answer
   x = 21,357.31