Finding the Fourth Proportional to 19,878.30, 29,817.42 and 5,086.74

Step by Step Solution

1. Step 1: Write the proportion equation
   19,878.30 : 29,817.42 = 5,086.74 : x
2. Step 2: Convert to fraction form
   19,878.30/29,817.42 = 5,086.74/x
3. Step 3: Cross multiply
   19,878.30x = 29,817.42 × 5,086.74
4. Step 4: Simplify right side
   19,878.30x = 151,673,463.01
5. Step 5: Solve for x
   x = 151,673,463.01/19,878.30
6. Step 6: Final answer
   x = 7,630.10