Finding the Fourth Proportional to 12,938.64, 17,855.12 and 7,631.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,938.64 : 17,855.12 = 7,631.52 : x
2. Step 2: Convert to fraction form
   12,938.64/17,855.12 = 7,631.52/x
3. Step 3: Cross multiply
   12,938.64x = 17,855.12 × 7,631.52
4. Step 4: Simplify right side
   12,938.64x = 136,261,705.38
5. Step 5: Solve for x
   x = 136,261,705.38/12,938.64
6. Step 6: Final answer
   x = 10,531.38