Finding the Fourth Proportional to 10,956.15, 16,428.15 and 4,715.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,956.15 : 16,428.15 = 4,715.10 : x
2. Step 2: Convert to fraction form
   10,956.15/16,428.15 = 4,715.10/x
3. Step 3: Cross multiply
   10,956.15x = 16,428.15 × 4,715.10
4. Step 4: Simplify right side
   10,956.15x = 77,460,370.07
5. Step 5: Solve for x
   x = 77,460,370.07/10,956.15
6. Step 6: Final answer
   x = 7,070.04