Finding the Fourth Proportional to 12,839.61, 17,715.42 and 7,533.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,839.61 : 17,715.42 = 7,533.40 : x
2. Step 2: Convert to fraction form
   12,839.61/17,715.42 = 7,533.40/x
3. Step 3: Cross multiply
   12,839.61x = 17,715.42 × 7,533.40
4. Step 4: Simplify right side
   12,839.61x = 133,457,333.96
5. Step 5: Solve for x
   x = 133,457,333.96/12,839.61
6. Step 6: Final answer
   x = 10,394.19