Finding the Fourth Proportional to 12,905.82, 17,810.21 and 7,528.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,905.82 : 17,810.21 = 7,528.10 : x
2. Step 2: Convert to fraction form
   12,905.82/17,810.21 = 7,528.10/x
3. Step 3: Cross multiply
   12,905.82x = 17,810.21 × 7,528.10
4. Step 4: Simplify right side
   12,905.82x = 134,077,105.25
5. Step 5: Solve for x
   x = 134,077,105.25/12,905.82
6. Step 6: Final answer
   x = 10,388.89