Finding the Fourth Proportional to 10,513.29, 15,842.28 and 8,705.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,513.29 : 15,842.28 = 8,705.10 : x
2. Step 2: Convert to fraction form
   10,513.29/15,842.28 = 8,705.10/x
3. Step 3: Cross multiply
   10,513.29x = 15,842.28 × 8,705.10
4. Step 4: Simplify right side
   10,513.29x = 137,908,631.63
5. Step 5: Solve for x
   x = 137,908,631.63/10,513.29
6. Step 6: Final answer
   x = 13,117.55