Finding the Fourth Proportional to 9,415.83, 12,988.90 and 7,173.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,415.83 : 12,988.90 = 7,173.82 : x
2. Step 2: Convert to fraction form
   9,415.83/12,988.90 = 7,173.82/x
3. Step 3: Cross multiply
   9,415.83x = 12,988.90 × 7,173.82
4. Step 4: Simplify right side
   9,415.83x = 93,179,977.69
5. Step 5: Solve for x
   x = 93,179,977.69/9,415.83
6. Step 6: Final answer
   x = 9,896.10