Finding the Fourth Proportional to 39,114.82, 53,978.16 and 21,210.04

Step by Step Solution

1. Step 1: Write the proportion equation
   39,114.82 : 53,978.16 = 21,210.04 : x
2. Step 2: Convert to fraction form
   39,114.82/53,978.16 = 21,210.04/x
3. Step 3: Cross multiply
   39,114.82x = 53,978.16 × 21,210.04
4. Step 4: Simplify right side
   39,114.82x = 1,144,878,932.73
5. Step 5: Solve for x
   x = 1,144,878,932.73/39,114.82
6. Step 6: Final answer
   x = 29,269.70