Finding the Fourth Proportional to 39,088.88, 53,941.86 and 21,861.20

Step by Step Solution

1. Step 1: Write the proportion equation
   39,088.88 : 53,941.86 = 21,861.20 : x
2. Step 2: Convert to fraction form
   39,088.88/53,941.86 = 21,861.20/x
3. Step 3: Cross multiply
   39,088.88x = 53,941.86 × 21,861.20
4. Step 4: Simplify right side
   39,088.88x = 1,179,233,789.83
5. Step 5: Solve for x
   x = 1,179,233,789.83/39,088.88
6. Step 6: Final answer
   x = 30,168.01