Finding the Fourth Proportional to 12,938.67, 17,855.43 and 7,561.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,938.67 : 17,855.43 = 7,561.42 : x
2. Step 2: Convert to fraction form
   12,938.67/17,855.43 = 7,561.42/x
3. Step 3: Cross multiply
   12,938.67x = 17,855.43 × 7,561.42
4. Step 4: Simplify right side
   12,938.67x = 135,012,405.51
5. Step 5: Solve for x
   x = 135,012,405.51/12,938.67
6. Step 6: Final answer
   x = 10,434.80