Finding the Fourth Proportional to 10,505.09, 15,762.42 and 3,931.79

Step by Step Solution

1. Step 1: Write the proportion equation
   10,505.09 : 15,762.42 = 3,931.79 : x
2. Step 2: Convert to fraction form
   10,505.09/15,762.42 = 3,931.79/x
3. Step 3: Cross multiply
   10,505.09x = 15,762.42 × 3,931.79
4. Step 4: Simplify right side
   10,505.09x = 61,974,431.78
5. Step 5: Solve for x
   x = 61,974,431.78/10,505.09
6. Step 6: Final answer
   x = 5,899.47