Finding the Fourth Proportional to 7,978.32, 11,897.19 and 7,424.28

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978.32 : 11,897.19 = 7,424.28 : x
2. Step 2: Convert to fraction form
   7,978.32/11,897.19 = 7,424.28/x
3. Step 3: Cross multiply
   7,978.32x = 11,897.19 × 7,424.28
4. Step 4: Simplify right side
   7,978.32x = 88,328,069.77
5. Step 5: Solve for x
   x = 88,328,069.77/7,978.32
6. Step 6: Final answer
   x = 11,071.01