Finding the Fourth Proportional to 12,591.84, 17,378.64 and 7,290.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,591.84 : 17,378.64 = 7,290.12 : x
2. Step 2: Convert to fraction form
   12,591.84/17,378.64 = 7,290.12/x
3. Step 3: Cross multiply
   12,591.84x = 17,378.64 × 7,290.12
4. Step 4: Simplify right side
   12,591.84x = 126,692,371.04
5. Step 5: Solve for x
   x = 126,692,371.04/12,591.84
6. Step 6: Final answer
   x = 10,061.47