Finding the Fourth Proportional to 9,379.32, 12,943.30 and 5,187.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,379.32 : 12,943.30 = 5,187.57 : x
2. Step 2: Convert to fraction form
   9,379.32/12,943.30 = 5,187.57/x
3. Step 3: Cross multiply
   9,379.32x = 12,943.30 × 5,187.57
4. Step 4: Simplify right side
   9,379.32x = 67,144,274.78
5. Step 5: Solve for x
   x = 67,144,274.78/9,379.32
6. Step 6: Final answer
   x = 7,158.76