Finding the Fourth Proportional to 9,978.45, 13,771.18 and 5,730.07

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.45 : 13,771.18 = 5,730.07 : x
2. Step 2: Convert to fraction form
   9,978.45/13,771.18 = 5,730.07/x
3. Step 3: Cross multiply
   9,978.45x = 13,771.18 × 5,730.07
4. Step 4: Simplify right side
   9,978.45x = 78,909,805.28
5. Step 5: Solve for x
   x = 78,909,805.28/9,978.45
6. Step 6: Final answer
   x = 7,908.02