Finding the Fourth Proportional to 13,439.72, 18,547.43 and 7,472.00

Step by Step Solution

1. Step 1: Write the proportion equation
   13,439.72 : 18,547.43 = 7,472.00 : x
2. Step 2: Convert to fraction form
   13,439.72/18,547.43 = 7,472.00/x
3. Step 3: Cross multiply
   13,439.72x = 18,547.43 × 7,472.00
4. Step 4: Simplify right side
   13,439.72x = 138,586,266.86
5. Step 5: Solve for x
   x = 138,586,266.86/13,439.72
6. Step 6: Final answer
   x = 10,311.70