Finding the Fourth Proportional to 39,061.10, 53,904.29 and 21,156.09

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.10 : 53,904.29 = 21,156.09 : x
2. Step 2: Convert to fraction form
   39,061.10/53,904.29 = 21,156.09/x
3. Step 3: Cross multiply
   39,061.10x = 53,904.29 × 21,156.09
4. Step 4: Simplify right side
   39,061.10x = 1,140,403,904.85
5. Step 5: Solve for x
   x = 1,140,403,904.85/39,061.10
6. Step 6: Final answer
   x = 29,195.39