Finding the Fourth Proportional to 7,335.96, 10,123.72 and 3,978.80

Step by Step Solution

1. Step 1: Write the proportion equation
   7,335.96 : 10,123.72 = 3,978.80 : x
2. Step 2: Convert to fraction form
   7,335.96/10,123.72 = 3,978.80/x
3. Step 3: Cross multiply
   7,335.96x = 10,123.72 × 3,978.80
4. Step 4: Simplify right side
   7,335.96x = 40,280,257.14
5. Step 5: Solve for x
   x = 40,280,257.14/7,335.96
6. Step 6: Final answer
   x = 5,490.80