Finding the Fourth Proportional to 19,870.72, 29,802.89 and 5,078.85

Step by Step Solution

1. Step 1: Write the proportion equation
   19,870.72 : 29,802.89 = 5,078.85 : x
2. Step 2: Convert to fraction form
   19,870.72/29,802.89 = 5,078.85/x
3. Step 3: Cross multiply
   19,870.72x = 29,802.89 × 5,078.85
4. Step 4: Simplify right side
   19,870.72x = 151,364,447.89
5. Step 5: Solve for x
   x = 151,364,447.89/19,870.72
6. Step 6: Final answer
   x = 7,617.46