Finding the Fourth Proportional to 35,388.90, 48,826.80 and 21,960.72

Step by Step Solution

1. Step 1: Write the proportion equation
   35,388.90 : 48,826.80 = 21,960.72 : x
2. Step 2: Convert to fraction form
   35,388.90/48,826.80 = 21,960.72/x
3. Step 3: Cross multiply
   35,388.90x = 48,826.80 × 21,960.72
4. Step 4: Simplify right side
   35,388.90x = 1,072,271,683.30
5. Step 5: Solve for x
   x = 1,072,271,683.30/35,388.90
6. Step 6: Final answer
   x = 30,299.66