Finding the Fourth Proportional to 39,061.52, 53,904.63 and 21,156.12

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.52 : 53,904.63 = 21,156.12 : x
2. Step 2: Convert to fraction form
   39,061.52/53,904.63 = 21,156.12/x
3. Step 3: Cross multiply
   39,061.52x = 53,904.63 × 21,156.12
4. Step 4: Simplify right side
   39,061.52x = 1,140,412,820.84
5. Step 5: Solve for x
   x = 1,140,412,820.84/39,061.52
6. Step 6: Final answer
   x = 29,195.30