Finding the Fourth Proportional to 39,938.31, 55,075.50 and 30,982.55

Step by Step Solution

1. Step 1: Write the proportion equation
   39,938.31 : 55,075.50 = 30,982.55 : x
2. Step 2: Convert to fraction form
   39,938.31/55,075.50 = 30,982.55/x
3. Step 3: Cross multiply
   39,938.31x = 55,075.50 × 30,982.55
4. Step 4: Simplify right side
   39,938.31x = 1,706,379,157.15
5. Step 5: Solve for x
   x = 1,706,379,157.15/39,938.31
6. Step 6: Final answer
   x = 42,725.37