Finding the Fourth Proportional to 12,906.30, 17,810.90 and 7,242.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,906.30 : 17,810.90 = 7,242.30 : x
2. Step 2: Convert to fraction form
   12,906.30/17,810.90 = 7,242.30/x
3. Step 3: Cross multiply
   12,906.30x = 17,810.90 × 7,242.30
4. Step 4: Simplify right side
   12,906.30x = 128,991,844.86
5. Step 5: Solve for x
   x = 128,991,844.86/12,906.30
6. Step 6: Final answer
   x = 9,994.49