Finding the Fourth Proportional to 9,368.68, 12,930.06 and 5,389.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,368.68 : 12,930.06 = 5,389.72 : x
2. Step 2: Convert to fraction form
   9,368.68/12,930.06 = 5,389.72/x
3. Step 3: Cross multiply
   9,368.68x = 12,930.06 × 5,389.72
4. Step 4: Simplify right side
   9,368.68x = 69,689,402.98
5. Step 5: Solve for x
   x = 69,689,402.98/9,368.68
6. Step 6: Final answer
   x = 7,438.55