Finding the Fourth Proportional to 39,892.46, 55,049.12 and 21,987.62

Step by Step Solution

1. Step 1: Write the proportion equation
   39,892.46 : 55,049.12 = 21,987.62 : x
2. Step 2: Convert to fraction form
   39,892.46/55,049.12 = 21,987.62/x
3. Step 3: Cross multiply
   39,892.46x = 55,049.12 × 21,987.62
4. Step 4: Simplify right side
   39,892.46x = 1,210,398,746.71
5. Step 5: Solve for x
   x = 1,210,398,746.71/39,892.46
6. Step 6: Final answer
   x = 30,341.55