Finding the Fourth Proportional to 19,619.78, 29,422.31 and 7,136.15

Step by Step Solution

1. Step 1: Write the proportion equation
   19,619.78 : 29,422.31 = 7,136.15 : x
2. Step 2: Convert to fraction form
   19,619.78/29,422.31 = 7,136.15/x
3. Step 3: Cross multiply
   19,619.78x = 29,422.31 × 7,136.15
4. Step 4: Simplify right side
   19,619.78x = 209,962,108.90
5. Step 5: Solve for x
   x = 209,962,108.90/19,619.78
6. Step 6: Final answer
   x = 10,701.56