Finding the Fourth Proportional to 8,762.81, 12,061.98 and 7,641.77

Step by Step Solution

1. Step 1: Write the proportion equation
   8,762.81 : 12,061.98 = 7,641.77 : x
2. Step 2: Convert to fraction form
   8,762.81/12,061.98 = 7,641.77/x
3. Step 3: Cross multiply
   8,762.81x = 12,061.98 × 7,641.77
4. Step 4: Simplify right side
   8,762.81x = 92,174,816.59
5. Step 5: Solve for x
   x = 92,174,816.59/8,762.81
6. Step 6: Final answer
   x = 10,518.87