Finding the Fourth Proportional to 39,892.52, 55,051.38 and 21,987.56

Step by Step Solution

1. Step 1: Write the proportion equation
   39,892.52 : 55,051.38 = 21,987.56 : x
2. Step 2: Convert to fraction form
   39,892.52/55,051.38 = 21,987.56/x
3. Step 3: Cross multiply
   39,892.52x = 55,051.38 × 21,987.56
4. Step 4: Simplify right side
   39,892.52x = 1,210,445,520.83
5. Step 5: Solve for x
   x = 1,210,445,520.83/39,892.52
6. Step 6: Final answer
   x = 30,342.67