Finding the Fourth Proportional to 9,285.17, 12,812.18 and 5,305.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,285.17 : 12,812.18 = 5,305.50 : x
2. Step 2: Convert to fraction form
   9,285.17/12,812.18 = 5,305.50/x
3. Step 3: Cross multiply
   9,285.17x = 12,812.18 × 5,305.50
4. Step 4: Simplify right side
   9,285.17x = 67,974,994.46
5. Step 5: Solve for x
   x = 67,974,994.46/9,285.17
6. Step 6: Final answer
   x = 7,320.82