Finding the Fourth Proportional to 10,447.17, 14,390.91 and 7,790.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,447.17 : 14,390.91 = 7,790.10 : x
2. Step 2: Convert to fraction form
   10,447.17/14,390.91 = 7,790.10/x
3. Step 3: Cross multiply
   10,447.17x = 14,390.91 × 7,790.10
4. Step 4: Simplify right side
   10,447.17x = 112,106,627.99
5. Step 5: Solve for x
   x = 112,106,627.99/10,447.17
6. Step 6: Final answer
   x = 10,730.81