Finding the Fourth Proportional to 39,196.31, 54,090.01 and 21,290.92

Step by Step Solution

1. Step 1: Write the proportion equation
   39,196.31 : 54,090.01 = 21,290.92 : x
2. Step 2: Convert to fraction form
   39,196.31/54,090.01 = 21,290.92/x
3. Step 3: Cross multiply
   39,196.31x = 54,090.01 × 21,290.92
4. Step 4: Simplify right side
   39,196.31x = 1,151,626,075.71
5. Step 5: Solve for x
   x = 1,151,626,075.71/39,196.31
6. Step 6: Final answer
   x = 29,380.98