Finding the Fourth Proportional to 12,890.32, 17,789 and 7,301.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,890.32 : 17,789 = 7,301.20 : x
2. Step 2: Convert to fraction form
   12,890.32/17,789 = 7,301.20/x
3. Step 3: Cross multiply
   12,890.32x = 17,789 × 7,301.20
4. Step 4: Simplify right side
   12,890.32x = 129,881,046.80
5. Step 5: Solve for x
   x = 129,881,046.80/12,890.32
6. Step 6: Final answer
   x = 10,075.86