Finding the Fourth Proportional to 9,403.05, 12,978.54 and 5,426.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,403.05 : 12,978.54 = 5,426.55 : x
2. Step 2: Convert to fraction form
   9,403.05/12,978.54 = 5,426.55/x
3. Step 3: Cross multiply
   9,403.05x = 12,978.54 × 5,426.55
4. Step 4: Simplify right side
   9,403.05x = 70,428,696.24
5. Step 5: Solve for x
   x = 70,428,696.24/9,403.05
6. Step 6: Final answer
   x = 7,489.98