Finding the Fourth Proportional to 10,561.79, 15,845.67 and 5,290.43

Step by Step Solution

1. Step 1: Write the proportion equation
   10,561.79 : 15,845.67 = 5,290.43 : x
2. Step 2: Convert to fraction form
   10,561.79/15,845.67 = 5,290.43/x
3. Step 3: Cross multiply
   10,561.79x = 15,845.67 × 5,290.43
4. Step 4: Simplify right side
   10,561.79x = 83,830,388.13
5. Step 5: Solve for x
   x = 83,830,388.13/10,561.79
6. Step 6: Final answer
   x = 7,937.14