Finding the Fourth Proportional to 9,151.59, 12,621.04 and 7,135.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,151.59 : 12,621.04 = 7,135.50 : x
2. Step 2: Convert to fraction form
   9,151.59/12,621.04 = 7,135.50/x
3. Step 3: Cross multiply
   9,151.59x = 12,621.04 × 7,135.50
4. Step 4: Simplify right side
   9,151.59x = 90,057,430.92
5. Step 5: Solve for x
   x = 90,057,430.92/9,151.59
6. Step 6: Final answer
   x = 9,840.63