Finding the Fourth Proportional to 19,912.78, 29,870.25 and 5,121.82

Step by Step Solution

1. Step 1: Write the proportion equation
   19,912.78 : 29,870.25 = 5,121.82 : x
2. Step 2: Convert to fraction form
   19,912.78/29,870.25 = 5,121.82/x
3. Step 3: Cross multiply
   19,912.78x = 29,870.25 × 5,121.82
4. Step 4: Simplify right side
   19,912.78x = 152,989,868.89
5. Step 5: Solve for x
   x = 152,989,868.89/19,912.78
6. Step 6: Final answer
   x = 7,683.00