Finding the Fourth Proportional to 39,048.50, 53,886.85 and 21,143.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,048.50 : 53,886.85 = 21,143.50 : x
2. Step 2: Convert to fraction form
   39,048.50/53,886.85 = 21,143.50/x
3. Step 3: Cross multiply
   39,048.50x = 53,886.85 × 21,143.50
4. Step 4: Simplify right side
   39,048.50x = 1,139,356,612.98
5. Step 5: Solve for x
   x = 1,139,356,612.98/39,048.50
6. Step 6: Final answer
   x = 29,177.99