Finding the Fourth Proportional to 89,139.68, 133,708.49 and 21,672.10

Step by Step Solution

1. Step 1: Write the proportion equation
   89,139.68 : 133,708.49 = 21,672.10 : x
2. Step 2: Convert to fraction form
   89,139.68/133,708.49 = 21,672.10/x
3. Step 3: Cross multiply
   89,139.68x = 133,708.49 × 21,672.10
4. Step 4: Simplify right side
   89,139.68x = 2,897,743,377.68
5. Step 5: Solve for x
   x = 2,897,743,377.68/89,139.68
6. Step 6: Final answer
   x = 32,507.90