Finding the Fourth Proportional to 30,881.10, 42,624.06 and 21,322.56

Step by Step Solution

1. Step 1: Write the proportion equation
   30,881.10 : 42,624.06 = 21,322.56 : x
2. Step 2: Convert to fraction form
   30,881.10/42,624.06 = 21,322.56/x
3. Step 3: Cross multiply
   30,881.10x = 42,624.06 × 21,322.56
4. Step 4: Simplify right side
   30,881.10x = 908,854,076.79
5. Step 5: Solve for x
   x = 908,854,076.79/30,881.10
6. Step 6: Final answer
   x = 29,430.75