Finding the Fourth Proportional to 11,860.07, 17,796.20 and 5,290.56

Step by Step Solution

1. Step 1: Write the proportion equation
   11,860.07 : 17,796.20 = 5,290.56 : x
2. Step 2: Convert to fraction form
   11,860.07/17,796.20 = 5,290.56/x
3. Step 3: Cross multiply
   11,860.07x = 17,796.20 × 5,290.56
4. Step 4: Simplify right side
   11,860.07x = 94,151,837.42
5. Step 5: Solve for x
   x = 94,151,837.42/11,860.07
6. Step 6: Final answer
   x = 7,938.56