Finding the Fourth Proportional to 9,678.68, 13,357.59 and 5,430.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,678.68 : 13,357.59 = 5,430.89 : x
2. Step 2: Convert to fraction form
   9,678.68/13,357.59 = 5,430.89/x
3. Step 3: Cross multiply
   9,678.68x = 13,357.59 × 5,430.89
4. Step 4: Simplify right side
   9,678.68x = 72,543,645.53
5. Step 5: Solve for x
   x = 72,543,645.53/9,678.68
6. Step 6: Final answer
   x = 7,495.20