Finding the Fourth Proportional to 35,435.34, 48,900.78 and 21,288.15

Step by Step Solution

1. Step 1: Write the proportion equation
   35,435.34 : 48,900.78 = 21,288.15 : x
2. Step 2: Convert to fraction form
   35,435.34/48,900.78 = 21,288.15/x
3. Step 3: Cross multiply
   35,435.34x = 48,900.78 × 21,288.15
4. Step 4: Simplify right side
   35,435.34x = 1,041,007,139.76
5. Step 5: Solve for x
   x = 1,041,007,139.76/35,435.34
6. Step 6: Final answer
   x = 29,377.65