Finding the Fourth Proportional to 9,389.31, 12,956.52 and 5,407.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,389.31 : 12,956.52 = 5,407.75 : x
2. Step 2: Convert to fraction form
   9,389.31/12,956.52 = 5,407.75/x
3. Step 3: Cross multiply
   9,389.31x = 12,956.52 × 5,407.75
4. Step 4: Simplify right side
   9,389.31x = 70,065,621.03
5. Step 5: Solve for x
   x = 70,065,621.03/9,389.31
6. Step 6: Final answer
   x = 7,462.28