Finding the Fourth Proportional to 42,142.48, 63,247.43 and 21,081.67

Step by Step Solution

1. Step 1: Write the proportion equation
   42,142.48 : 63,247.43 = 21,081.67 : x
2. Step 2: Convert to fraction form
   42,142.48/63,247.43 = 21,081.67/x
3. Step 3: Cross multiply
   42,142.48x = 63,247.43 × 21,081.67
4. Step 4: Simplify right side
   42,142.48x = 1,333,361,342.19
5. Step 5: Solve for x
   x = 1,333,361,342.19/42,142.48
6. Step 6: Final answer
   x = 31,639.37