Finding the Fourth Proportional to 9,978.29, 13,769.57 and 5,726.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.29 : 13,769.57 = 5,726.40 : x
2. Step 2: Convert to fraction form
   9,978.29/13,769.57 = 5,726.40/x
3. Step 3: Cross multiply
   9,978.29x = 13,769.57 × 5,726.40
4. Step 4: Simplify right side
   9,978.29x = 78,850,012.22
5. Step 5: Solve for x
   x = 78,850,012.22/9,978.29
6. Step 6: Final answer
   x = 7,902.16