Finding the Fourth Proportional to 31,490.96, 43,443.46 and 21,278.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,490.96 : 43,443.46 = 21,278.69 : x
2. Step 2: Convert to fraction form
   31,490.96/43,443.46 = 21,278.69/x
3. Step 3: Cross multiply
   31,490.96x = 43,443.46 × 21,278.69
4. Step 4: Simplify right side
   31,490.96x = 924,419,647.45
5. Step 5: Solve for x
   x = 924,419,647.45/31,490.96
6. Step 6: Final answer
   x = 29,355.08