Finding the Fourth Proportional to 39,080.80, 53,931.72 and 21,175.82

Step by Step Solution

1. Step 1: Write the proportion equation
   39,080.80 : 53,931.72 = 21,175.82 : x
2. Step 2: Convert to fraction form
   39,080.80/53,931.72 = 21,175.82/x
3. Step 3: Cross multiply
   39,080.80x = 53,931.72 × 21,175.82
4. Step 4: Simplify right side
   39,080.80x = 1,142,048,395.01
5. Step 5: Solve for x
   x = 1,142,048,395.01/39,080.80
6. Step 6: Final answer
   x = 29,222.75