Finding the Fourth Proportional to 7,335.72, 10,123.32 and 3,978.60

Step by Step Solution

1. Step 1: Write the proportion equation
   7,335.72 : 10,123.32 = 3,978.60 : x
2. Step 2: Convert to fraction form
   7,335.72/10,123.32 = 3,978.60/x
3. Step 3: Cross multiply
   7,335.72x = 10,123.32 × 3,978.60
4. Step 4: Simplify right side
   7,335.72x = 40,276,640.95
5. Step 5: Solve for x
   x = 40,276,640.95/7,335.72
6. Step 6: Final answer
   x = 5,490.48