Finding the Fourth Proportional to 39,061.48, 53,904.54 and 21,156.43

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.48 : 53,904.54 = 21,156.43 : x
2. Step 2: Convert to fraction form
   39,061.48/53,904.54 = 21,156.43/x
3. Step 3: Cross multiply
   39,061.48x = 53,904.54 × 21,156.43
4. Step 4: Simplify right side
   39,061.48x = 1,140,427,627.19
5. Step 5: Solve for x
   x = 1,140,427,627.19/39,061.48
6. Step 6: Final answer
   x = 29,195.71