Finding the Fourth Proportional to 9,400.79, 12,973.47 and 5,422.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,400.79 : 12,973.47 = 5,422.28 : x
2. Step 2: Convert to fraction form
   9,400.79/12,973.47 = 5,422.28/x
3. Step 3: Cross multiply
   9,400.79x = 12,973.47 × 5,422.28
4. Step 4: Simplify right side
   9,400.79x = 70,345,701.71
5. Step 5: Solve for x
   x = 70,345,701.71/9,400.79
6. Step 6: Final answer
   x = 7,482.95