Finding the Fourth Proportional to 12,681.74, 17,498.76 and 7,972.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,681.74 : 17,498.76 = 7,972.40 : x
2. Step 2: Convert to fraction form
   12,681.74/17,498.76 = 7,972.40/x
3. Step 3: Cross multiply
   12,681.74x = 17,498.76 × 7,972.40
4. Step 4: Simplify right side
   12,681.74x = 139,507,114.22
5. Step 5: Solve for x
   x = 139,507,114.22/12,681.74
6. Step 6: Final answer
   x = 11,000.63