Finding the Fourth Proportional to 9,622.50, 13,279.26 and 5,430.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,622.50 : 13,279.26 = 5,430.78 : x
2. Step 2: Convert to fraction form
   9,622.50/13,279.26 = 5,430.78/x
3. Step 3: Cross multiply
   9,622.50x = 13,279.26 × 5,430.78
4. Step 4: Simplify right side
   9,622.50x = 72,116,739.62
5. Step 5: Solve for x
   x = 72,116,739.62/9,622.50
6. Step 6: Final answer
   x = 7,494.59