Finding the Fourth Proportional to 35,500, 48,990 and 20,598.88

Step by Step Solution

1. Step 1: Write the proportion equation
   35,500 : 48,990 = 20,598.88 : x
2. Step 2: Convert to fraction form
   35,500/48,990 = 20,598.88/x
3. Step 3: Cross multiply
   35,500x = 48,990 × 20,598.88
4. Step 4: Simplify right side
   35,500x = 1,009,139,131.20
5. Step 5: Solve for x
   x = 1,009,139,131.20/35,500
6. Step 6: Final answer
   x = 28,426.45