Finding the Fourth Proportional to 9,355.59, 12,911.67 and 5,376.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,355.59 : 12,911.67 = 5,376.87 : x
2. Step 2: Convert to fraction form
   9,355.59/12,911.67 = 5,376.87/x
3. Step 3: Cross multiply
   9,355.59x = 12,911.67 × 5,376.87
4. Step 4: Simplify right side
   9,355.59x = 69,424,371.07
5. Step 5: Solve for x
   x = 69,424,371.07/9,355.59
6. Step 6: Final answer
   x = 7,420.63