Finding the Fourth Proportional to 28,131.78, 42,196.55 and 7,071.99

Step by Step Solution

1. Step 1: Write the proportion equation
   28,131.78 : 42,196.55 = 7,071.99 : x
2. Step 2: Convert to fraction form
   28,131.78/42,196.55 = 7,071.99/x
3. Step 3: Cross multiply
   28,131.78x = 42,196.55 × 7,071.99
4. Step 4: Simplify right side
   28,131.78x = 298,413,544.27
5. Step 5: Solve for x
   x = 298,413,544.27/28,131.78
6. Step 6: Final answer
   x = 10,607.70