Finding the Fourth Proportional to 12,745, 17,588.10 and 7,156.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,745 : 17,588.10 = 7,156.12 : x
2. Step 2: Convert to fraction form
   12,745/17,588.10 = 7,156.12/x
3. Step 3: Cross multiply
   12,745x = 17,588.10 × 7,156.12
4. Step 4: Simplify right side
   12,745x = 125,862,554.17
5. Step 5: Solve for x
   x = 125,862,554.17/12,745
6. Step 6: Final answer
   x = 9,875.45