Finding the Fourth Proportional to 9,621.98, 13,278.60 and 5,430.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,621.98 : 13,278.60 = 5,430.50 : x
2. Step 2: Convert to fraction form
   9,621.98/13,278.60 = 5,430.50/x
3. Step 3: Cross multiply
   9,621.98x = 13,278.60 × 5,430.50
4. Step 4: Simplify right side
   9,621.98x = 72,109,437.30
5. Step 5: Solve for x
   x = 72,109,437.30/9,621.98
6. Step 6: Final answer
   x = 7,494.24