Finding the Fourth Proportional to 9,409.18, 12,985.98 and 5,430.22

Step by Step Solution

1. Step 1: Write the proportion equation
   9,409.18 : 12,985.98 = 5,430.22 : x
2. Step 2: Convert to fraction form
   9,409.18/12,985.98 = 5,430.22/x
3. Step 3: Cross multiply
   9,409.18x = 12,985.98 × 5,430.22
4. Step 4: Simplify right side
   9,409.18x = 70,516,728.32
5. Step 5: Solve for x
   x = 70,516,728.32/9,409.18
6. Step 6: Final answer
   x = 7,494.46